# .NET Core 3.1.0 Preview 1 - October 15, 2019

.NET Core 3.1.0 Preview 1 is available for download and usage in your environment. This release includes .NET Core 3.1.0 Preview 1 and .NET Core SDK 3.1.100 Preview 1.

**Visual Studio compatibility:** .NET Core 3.1 Preview 1 requires Visual Studio 2019 16.4 Preview 2 to take full advantage of all its features. .NET Core 3.1 Preview 1 will not work properly in earlier versions of Visual Studio. Visit [Visual Studio Preview](https://visualstudio.microsoft.com/vs/preview/) to learn about VS previews.

**Known Issue:** Visual Studio 16.4 Preview 2 may uninstall .NET Core 3.0 when installed the .NET Core 3.1 SDK. We recommend you re-install or repair the [.NET Core 3.0 SDK](https://dotnet.microsoft.com/download/dotnet-core/3.0) if this happens. 

* [Downloads](https://dotnet.microsoft.com/download/dotnet-core/3.1)
* [Changes in this release](#notable-changes-in-310-preview-1)
* [Known issues](../3.1-known-issues.md)

## Blog Roundup

* [.NET Core 3.1 Preview 1][dotnet-blog]
* [ASP.NET Core][aspnet-blog]

The .NET Core SDK 3.1.100 Preview 1 includes .NET Core 3.1 Runtime so downloading the runtime packages separately is not needed when installing the SDK. After installing the .NET Core SDK 3.1.100 preview, the following command will show that you're running version `3.1.100-preview1-014459` of the tools.

`dotnet --version`

Your feedback is important and appreciated. We've created an issue at [dotnet/core #3634](https://github.com/dotnet/core/issues/3634) for your questions and comments.

## Downloads

|           | SDK Installer<sup>1</sup>                        | SDK Binaries<sup>1</sup>                 | Runtime Installer                                        | Runtime Binaries                                 | ASP.NET Core Runtime           |
| --------- | :------------------------------------------:     | :----------------------:                 | :---------------------------:                            | :-------------------------:                      | :-----------------:            |
| Windows   | [x86][dotnet-sdk-win-x86.exe] \| [x64][dotnet-sdk-win-x64.exe] | [x86][dotnet-sdk-win-x86.zip] \| [x64][dotnet-sdk-win-x64.zip] \| [ARM][dotnet-sdk-win-arm.zip] | [x86][dotnet-runtime-win-x86.exe] \| [x64][dotnet-runtime-win-x64.exe] | [x86][dotnet-runtime-win-x86.zip] \| [x64][dotnet-runtime-win-x64.zip] \| [ARM][dotnet-runtime-win-arm.zip]  | [x86][aspnetcore-runtime-win-x86.exe] \| [x64][aspnetcore-runtime-win-x64.exe] \| [ARM][aspnetcore-runtime-win-arm.zip] \|<br> [Hosting Bundle][dotnet-hosting-win.exe]<sup>2</sup> |
| macOS     | [x64][dotnet-sdk-osx-x64.pkg]  | [x64][dotnet-sdk-osx-x64.tar.gz]     | [x64][dotnet-runtime-osx-x64.pkg] | [x64][dotnet-runtime-osx-x64.tar.gz] | [x64][aspnetcore-runtime-osx-x64.tar.gz]<sup>1</sup>
| Linux     |  [Snap Install](3.1.0-preview1-download.md)  | [x64][dotnet-sdk-linux-x64.tar.gz] \| [ARM][dotnet-sdk-linux-arm.tar.gz] \| [ARM64][dotnet-sdk-linux-arm64.tar.gz] \| [x64 Alpine][dotnet-sdk-linux-musl-x64.tar.gz] | - | [x64][dotnet-runtime-linux-x64.tar.gz] \| [ARM][dotnet-runtime-linux-arm.tar.gz] \| [ARM64][dotnet-runtime-linux-arm64.tar.gz] \| [x64 Alpine][dotnet-runtime-linux-musl-x64.tar.gz] | [x64][aspnetcore-runtime-linux-x64.tar.gz]<sup>1</sup>  \| [ARM][aspnetcore-runtime-linux-arm.tar.gz]<sup>1</sup> \| [ARM64][aspnetcore-runtime-linux-arm64.tar.gz]<sup>1</sup> \| [x64 Alpine][aspnetcore-runtime-linux-musl-x64.tar.gz]<sup>1</sup> |
| RHEL6     | -                                                | [x64][dotnet-sdk-rhel.6-x64.tar.gz]                    | -                                                        | [x64][dotnet-runtime-rhel.6-x64.tar.gz] | - |
| Checksums | [SDK][checksums-sdk]                             | -                                        | [Runtime][checksums-runtime]                             | - | - |

1. Includes the .NET Core and ASP.NET Core Runtimes
2. For hosting stand-alone apps on Windows Servers. Includes the ASP.NET Core Module for IIS and can be installed separately on servers without installing .NET Core runtime.

## Docker Images

The [.NET Core Docker images](https://hub.docker.com/r/microsoft/dotnet/) have been updated for this release. Details on our Docker versioning and how to work with the images can be seen in ["Staying up-to-date with .NET Container Images"](https://blogs.msdn.microsoft.com/dotnet/2018/06/18/staying-up-to-date-with-net-container-images/).

The following repos have been updated

* [microsoft/dotnet](https://hub.docker.com/r/microsoft/dotnet)
* [microsoft/dotnet-samples](https://hub.docker.com/r/microsoft/dotnet-samples)

## Notable Changes in 3.1.0 Preview 1

Here is list of some of the additions and updates we're excited to bring in Preview 1. See the [.NET][dotnet-blog] and [ASP.NET Core][aspnet-blog] blogs for additional details.

* CoreCLR: [bugs][coreclr_bugs] | [features][coreclr_features]
* CoreFX: [bugs][corefx_bugs] | [features][corefx_features]
* ASP.NET Core: [bugs][aspnet_bugs] | [features][aspnet_features]

[blob-runtime]: https://dotnetcli.blob.core.windows.net/dotnet/Runtime/
[blob-sdk]: https://dotnetcli.blob.core.windows.net/dotnet/Sdk/
[release-notes]: https://github.com/dotnet/core/blob/master/release-notes/3.1/preview/3.1.0-preview1.md

[checksums-runtime]: https://dotnetcli.blob.core.windows.net/dotnet/checksums/3.1.0-preview1-sha.txt
[checksums-sdk]: https://dotnetcli.blob.core.windows.net/dotnet/checksums/3.1.0-preview1-sha.txt

[linux-install]: https://docs.microsoft.com/dotnet/core/install/linux
[linux-setup]: https://github.com/dotnet/core/blob/master/Documentation/linux-setup.md

[dotnet-blog]: https://devblogs.microsoft.com/dotnet/announcing-net-core-3-1-preview-1/
[aspnet-blog]: https://devblogs.microsoft.com/aspnet/asp-net-core-updates-in-net-core-3-1-preview-1/
[ef-blog]: https://devblogs.microsoft.com/dotnet/announcing-entity-framework-core-3-1-preview-1-and-entity-framework-6-4-preview-1

[aspnet_bugs]: https://github.com/aspnet/AspNetCore/issues?q=is%3Aissue+milestone%3A3.1.0-preview1+label%3ADone+label%3Abug
[aspnet_features]: https://github.com/aspnet/AspNetCore/issues?q=is%3Aissue+milestone%3A3.1.0-preview1+label%3ADone+label%3Aenhancement
[coreclr_bugs]: https://github.com/dotnet/coreclr/issues?utf8=%E2%9C%93&q=is%3Aissue+milestone%3A3.1+label%3Abug+
[coreclr_features]: https://github.com/dotnet/coreclr/issues?q=is%3Aissue+milestone%3A3.1+label%3Aenhancement
[corefx_bugs]: https://github.com/dotnet/corefx/issues?q=is%3Aissue+milestone%3A3.1+label%3Abug
[corefx_features]: https://github.com/dotnet/corefx/issues?q=is%3Aissue+milestone%3A3.1+label%3Aenhancement

[//]: # ( Runtime 3.1.0-preview1.19506.1)
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[dotnet-apphost-pack-x64.rpm]: https://download.visualstudio.microsoft.com/download/pr/c6b55422-82d3-4408-b3fb-ff12a48cc812/38a7aa45b20c6dcdb9b911666ee6f5fc/dotnet-apphost-pack-3.1.0-preview1.19506.1-x64.rpm
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[dotnet-host-x64.rpm]: https://download.visualstudio.microsoft.com/download/pr/1cb4dfea-3cd1-4308-9715-d445a8e90a87/b559fcff820841d269a27377f0295498/dotnet-host-3.1.0-preview1.19506.1-x64.rpm
[dotnet-hostfxr-x64.deb]: https://download.visualstudio.microsoft.com/download/pr/69fb2983-1487-4411-8605-0927f9daaf86/a34dcd100e38e2f9b05a3d35f3fd585e/dotnet-hostfxr-3.1.0-preview1.19506.1-x64.deb
[dotnet-hostfxr-x64.rpm]: https://download.visualstudio.microsoft.com/download/pr/c1b73692-a4aa-46b3-b828-db061bd3c97f/7a4a3084955371f76e9d96a2319c4f18/dotnet-hostfxr-3.1.0-preview1.19506.1-x64.rpm
[dotnet-hosting-win.exe]: https://download.visualstudio.microsoft.com/download/pr/01ae3780-2579-432e-a8c2-481630062eed/6730c8e85750f19ae148d1afc0e72bad/dotnet-hosting-3.1.0-preview1.19508.20-win.exe
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[dotnet-runtime-linux-arm64.tar.gz]: https://download.visualstudio.microsoft.com/download/pr/742876f3-281d-4cea-a9dc-8242983421b9/32282c7b47776829b4d7a2c4781dd30f/dotnet-runtime-3.1.0-preview1.19506.1-linux-arm64.tar.gz
[dotnet-runtime-linux-musl-x64.tar.gz]: https://download.visualstudio.microsoft.com/download/pr/113caf13-dca3-47e9-8618-2234c3bda682/ad9bb28adc46615fe06c217dbc37dc4e/dotnet-runtime-3.1.0-preview1.19506.1-linux-musl-x64.tar.gz
[dotnet-runtime-linux-x64.tar.gz]: https://download.visualstudio.microsoft.com/download/pr/2ceb8e42-f900-4500-9de0-9b159ed81b26/c1bc099d2bd35c76bf38e694df4a9226/dotnet-runtime-3.1.0-preview1.19506.1-linux-x64.tar.gz
[dotnet-runtime-osx-x64.pkg]: https://download.visualstudio.microsoft.com/download/pr/50d73b14-9a37-4e53-a2dd-185772a7a8a1/683df9537ff2e24da62f66c624b37211/dotnet-runtime-3.1.0-preview1.19506.1-osx-x64.pkg
[dotnet-runtime-osx-x64.tar.gz]: https://download.visualstudio.microsoft.com/download/pr/73285ebb-04a3-458b-b214-95f86322d659/c18f8d94a6938f593a3e9b2e78634763/dotnet-runtime-3.1.0-preview1.19506.1-osx-x64.tar.gz
[dotnet-runtime-rhel.6-x64.tar.gz]: https://download.visualstudio.microsoft.com/download/pr/c759f754-3580-433c-941a-5a037d961093/e25d1aa51e060456a145886c9051391e/dotnet-runtime-3.1.0-preview1.19506.1-rhel.6-x64.tar.gz
[dotnet-runtime-win-arm.zip]: https://download.visualstudio.microsoft.com/download/pr/c0452a1f-84c5-4cfe-b821-26a9e6cba298/a99144a292baff6a62cb378461a82c62/dotnet-runtime-3.1.0-preview1.19506.1-win-arm.zip
[dotnet-runtime-win-x64.exe]: https://download.visualstudio.microsoft.com/download/pr/1bf0a2c1-a8b7-4a4f-a11b-ea940c01993a/1ab8d70e092a1da6fdc9ebf2a617837b/dotnet-runtime-3.1.0-preview1.19506.1-win-x64.exe
[dotnet-runtime-win-x64.zip]: https://download.visualstudio.microsoft.com/download/pr/976ca3c2-6023-44a1-854e-f23b31b76e1c/90a8e10622407dcd0933684f6b18801d/dotnet-runtime-3.1.0-preview1.19506.1-win-x64.zip
[dotnet-runtime-win-x86.exe]: https://download.visualstudio.microsoft.com/download/pr/ed77351f-b3c4-465d-aee8-8397e9ca7cb0/c4dcbbf243bb88caa71c6df9197d8136/dotnet-runtime-3.1.0-preview1.19506.1-win-x86.exe
[dotnet-runtime-win-x86.zip]: https://download.visualstudio.microsoft.com/download/pr/eca1e2b1-134a-4c40-bb4a-ded1589d11ca/8ae3f156fb4048c88ba45d7b2be7cd88/dotnet-runtime-3.1.0-preview1.19506.1-win-x86.zip
[dotnet-runtime-x64.deb]: https://download.visualstudio.microsoft.com/download/pr/cb9fc2e4-8257-4104-a369-ca8ce543bc00/49b48fa9106a0fb283141ed81c0ca607/dotnet-runtime-3.1.0-preview1.19506.1-x64.deb
[dotnet-runtime-x64.rpm]: https://download.visualstudio.microsoft.com/download/pr/6beda08b-6189-45d2-a20a-033407d9a5fc/c95ac69416fd81fc0882a7cadb033444/dotnet-runtime-3.1.0-preview1.19506.1-x64.rpm
[dotnet-runtime-deps-centos.7-x64.rpm]: https://download.visualstudio.microsoft.com/download/pr/2441e0a7-22a4-4515-a7fd-f9a990e7abdd/837bf74eca65ff0932ce6763413dfad8/dotnet-runtime-deps-3.1.0-preview1.19506.1-centos.7-x64.rpm
[dotnet-runtime-deps-fedora.27-x64.rpm]: https://download.visualstudio.microsoft.com/download/pr/c321b140-ce08-4ad4-a082-1d2c75f80ed2/de026d15ace3ed93dadae71aae2abcaf/dotnet-runtime-deps-3.1.0-preview1.19506.1-fedora.27-x64.rpm
[dotnet-runtime-deps-opensuse.42-x64.rpm]: https://download.visualstudio.microsoft.com/download/pr/f2a006d7-8a33-48d9-9750-ed6dbc43e790/16b18a3c276242eb73d57d69bbbf3f78/dotnet-runtime-deps-3.1.0-preview1.19506.1-opensuse.42-x64.rpm
[dotnet-runtime-deps-oraclelinux.7-x64.rpm]: https://download.visualstudio.microsoft.com/download/pr/22b5f66e-9588-4476-b75b-8b112ddb0891/8e1efaddf09670dd0c15a784024feb5d/dotnet-runtime-deps-3.1.0-preview1.19506.1-oraclelinux.7-x64.rpm
[dotnet-runtime-deps-rhel.7-x64.rpm]: https://download.visualstudio.microsoft.com/download/pr/ad7e45e5-6cdc-40e8-a39a-903c3694b522/1e661e8d38d9276922b359450ebd3583/dotnet-runtime-deps-3.1.0-preview1.19506.1-rhel.7-x64.rpm
[dotnet-runtime-deps-sles.12-x64.rpm]: https://download.visualstudio.microsoft.com/download/pr/00399049-cb5b-4b5c-a1e5-0b0a45365675/38381ad1a904457487e63d64c9760c90/dotnet-runtime-deps-3.1.0-preview1.19506.1-sles.12-x64.rpm
[dotnet-runtime-deps-x64.deb]: https://download.visualstudio.microsoft.com/download/pr/9ebf702d-109d-4226-bdd7-f28295088d42/fa17aad9d1283c6a7647a49065470bea/dotnet-runtime-deps-3.1.0-preview1.19506.1-x64.deb
[dotnet-targeting-pack-x64.deb]: https://download.visualstudio.microsoft.com/download/pr/91e262b4-9cdc-4486-9537-7561050f5123/b1dc8c3e122f8c32e91d241c47a37d76/dotnet-targeting-pack-3.1.0-preview1.19506.1-x64.deb
[dotnet-targeting-pack-x64.rpm]: https://download.visualstudio.microsoft.com/download/pr/320c8699-452b-4856-8f32-024bf1e1b6df/e2478d5a0ea5da1c59512ac404613558/dotnet-targeting-pack-3.1.0-preview1.19506.1-x64.rpm
[windowsdesktop-runtime-win-x64.exe]: https://download.visualstudio.microsoft.com/download/pr/54d047f4-55f1-468c-b617-046507a19b28/c939c5b29580d7baf32d64cecc5f6c60/windowsdesktop-runtime-3.1.0-preview1.19506.1-win-x64.exe
[windowsdesktop-runtime-win-x86.exe]: https://download.visualstudio.microsoft.com/download/pr/5fbc4686-a00f-4c49-b3f8-d98cacec806e/a76394afa3ccc1c1e3000a9dc71c247d/windowsdesktop-runtime-3.1.0-preview1.19506.1-win-x86.exe

[//]: # ( ASP 3.1.0-preview1.19508.20)
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[aspnetcore-runtime-linux-x64.tar.gz]: https://download.visualstudio.microsoft.com/download/pr/66d6edaf-6183-4ecb-a536-7483b92b6047/6e7f38d9c03a4b786040db7b23a8fed4/aspnetcore-runtime-3.1.0-preview1.19508.20-linux-x64.tar.gz
[aspnetcore-runtime-osx-x64.tar.gz]: https://download.visualstudio.microsoft.com/download/pr/93811a37-ce18-4089-8e2a-fad0de68de3d/0a00a535c5d98a59c3f2606319899cf5/aspnetcore-runtime-3.1.0-preview1.19508.20-osx-x64.tar.gz
[aspnetcore-runtime-rh.rhel.7-x64.rpm]: https://download.visualstudio.microsoft.com/download/pr/cdd38fb7-5ef4-4f72-9a08-77d797a3f1bc/c7a7e96d1a8c7cc6ae64c32269061c49/aspnetcore-runtime-3.1.0-preview1.19508.20-rh.rhel.7-x64.rpm
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[aspnetcore-runtime-win-x64.exe]: https://download.visualstudio.microsoft.com/download/pr/ae466224-ec18-43f3-b51a-8e78b984bc62/8ba2c2d3e28e310dbad8bfeac58b054d/aspnetcore-runtime-3.1.0-preview1.19508.20-win-x64.exe
[aspnetcore-runtime-win-x64.zip]: https://download.visualstudio.microsoft.com/download/pr/de492131-8cf7-405b-bbab-5a281c355ef9/ef7dc88237ff912660702d5ddd6ae695/aspnetcore-runtime-3.1.0-preview1.19508.20-win-x64.zip
[aspnetcore-runtime-win-x86.exe]: https://download.visualstudio.microsoft.com/download/pr/2b13155d-362a-47d7-b6bb-ff97bfaf7843/f582d6fefc63ae5f859e483cbe266337/aspnetcore-runtime-3.1.0-preview1.19508.20-win-x86.exe
[aspnetcore-runtime-win-x86.zip]: https://download.visualstudio.microsoft.com/download/pr/8c7b3f62-206a-4c2a-b8af-3ac93bd2ed98/667e37391a36acb71e4bdf0eec328ae1/aspnetcore-runtime-3.1.0-preview1.19508.20-win-x86.zip
[aspnetcore-runtime-x64.deb]: https://download.visualstudio.microsoft.com/download/pr/c5ec79fb-a627-4c87-8029-171fc167197f/db20e6a985365e89150be1e2dc70a2ee/aspnetcore-runtime-3.1.0-preview1.19508.20-x64.deb
[aspnetcore-runtime-x64.rpm]: https://download.visualstudio.microsoft.com/download/pr/afb589d2-f71c-43d1-86d6-984d811930a4/08c21031cb6c13aa41779b189789ada5/aspnetcore-runtime-3.1.0-preview1.19508.20-x64.rpm
[aspnetcore-targeting-pack.deb]: https://download.visualstudio.microsoft.com/download/pr/bbb0636d-2e45-4f22-ba2a-6e85ba4aa360/c5385eb780203707a6f6a7b3dbcf4cf3/aspnetcore-targeting-pack-3.1.0-preview1.19508.20.deb
[aspnetcore-targeting-pack.rpm]: https://download.visualstudio.microsoft.com/download/pr/9e6533da-9d4e-4061-8c44-77b705a27eba/effff4c0c40e59d88e60017d12152ba7/aspnetcore-targeting-pack-3.1.0-preview1.19508.20.rpm
[dotnet-hosting-win.exe]: https://download.visualstudio.microsoft.com/download/pr/01ae3780-2579-432e-a8c2-481630062eed/6730c8e85750f19ae148d1afc0e72bad/dotnet-hosting-3.1.0-preview1.19508.20-win.exe

[//]: # ( SDK 3.1.100-preview1-014459 )
[dotnet-sdk-linux-arm.tar.gz]: https://download.visualstudio.microsoft.com/download/pr/add0da94-569b-462d-a3d4-f29407cb9386/9570da173af00033d6b5d9aaf6603450/dotnet-sdk-3.1.100-preview1-014459-linux-arm.tar.gz
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[dotnet-sdk-linux-x64.tar.gz]: https://download.visualstudio.microsoft.com/download/pr/a3cc3d8a-226d-4306-a61b-a5446fdb72ef/604e029047aec0229545e8c397a14ddb/dotnet-sdk-3.1.100-preview1-014459-linux-x64.tar.gz
[dotnet-sdk-osx-x64.pkg]: https://download.visualstudio.microsoft.com/download/pr/516f4938-dcb8-4e5a-aefc-0e7b11730a4b/9afc9a668d97ba280aa1962194305ba3/dotnet-sdk-3.1.100-preview1-014459-osx-x64.pkg
[dotnet-sdk-osx-x64.tar.gz]: https://download.visualstudio.microsoft.com/download/pr/1961368e-97df-439b-99ef-e14a6e65fa7c/73a793ceefdcf3348833843220fb2f1e/dotnet-sdk-3.1.100-preview1-014459-osx-x64.tar.gz
[dotnet-sdk-rhel.6-x64.tar.gz]: https://download.visualstudio.microsoft.com/download/pr/209443d9-2b6c-4eb5-950d-c9afc06ef7ce/f2ef7a20cb007976fbba8527233298ac/dotnet-sdk-3.1.100-preview1-014459-rhel.6-x64.tar.gz
[dotnet-sdk-win-arm.zip]: https://download.visualstudio.microsoft.com/download/pr/4c981b39-2075-43d1-8a75-863b886a7744/c1ecd27ae15df9a1c75585f5d0b5aebc/dotnet-sdk-3.1.100-preview1-014459-win-arm.zip
[dotnet-sdk-win-x64.exe]: https://download.visualstudio.microsoft.com/download/pr/3c80ce15-78a4-402c-a887-58119f2546b5/4bf7731ac1f278d7c8c9e30c81629316/dotnet-sdk-3.1.100-preview1-014459-win-x64.exe
[dotnet-sdk-win-x64.zip]: https://download.visualstudio.microsoft.com/download/pr/d5f66bc0-ceaf-4ae8-979a-348fce24f500/39a33cbdc8d33e3eb477b6dfd0d61efc/dotnet-sdk-3.1.100-preview1-014459-win-x64.zip
[dotnet-sdk-win-x86.exe]: https://download.visualstudio.microsoft.com/download/pr/0f899d0e-8403-448d-b206-5bacbed34b46/5394c8fc72225aebce4a022c2469bb7b/dotnet-sdk-3.1.100-preview1-014459-win-x86.exe
[dotnet-sdk-win-x86.zip]: https://download.visualstudio.microsoft.com/download/pr/27d2c031-1df4-42e9-8496-489e3c0eec3b/e50eba8133e81061034266227513664d/dotnet-sdk-3.1.100-preview1-014459-win-x86.zip
[dotnet-sdk-x64.deb]: https://download.visualstudio.microsoft.com/download/pr/84eb3f51-bd69-4c68-b03d-4ce3a83822f1/1d35ddefa5fd2b3bd15430253cfc0521/dotnet-sdk-3.1.100-preview1-014459-x64.deb
[dotnet-sdk-x64.rpm]: https://download.visualstudio.microsoft.com/download/pr/8862b83f-5364-457a-b42b-4bd0da1d122f/0043c62703d4498904d606b769ba3dff/dotnet-sdk-3.1.100-preview1-014459-x64.rpm
