BUTFIRSTS

Synopsis
BUTFIRSTS list
BFS list
Description

Outputs a list containing the BUTFIRST of each member of the input list. It is an error if any member of the input list is empty. The input itself may be empty, in which case the output is also empty.

Example
SHOW BUTFIRSTS [[1 2 3] [a b c]]
[[2 3] [c d]]

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