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To join Slack, use this invitation:
https://join.slack.com/t/nephio/shared_invite/zt-1d9m4ywr51e33io92d-93syvLZNJockrBuQ4f9KJgfxU272t_CKE8bryUlgDP2A
If that is expired or full (it works for up to 100 people), please send a note to sig-release@nephio.org and we can generate a new invitation.