@Mostafa_El_Ayoubi @Kulkul I’m sorry man to annoyed you again , I need your help I tried so much time to solve it it’s not working, the same topic renumbers the door can you please check this photo [image] I have three question 1-how I can remove “No to room” from the list I think it makes Null …

Remove null result

Kulkul October 10, 2016, 10:48am 2

Use List.Clean node set false for preserveIndices.

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