≠
≠Y marks first occurrences of major cells. Uses tolerant comparison and first matching representatives.
≠Y
≠3 1 3 2 1 ⍝ 1x 1x 0x 1x 0x
X≠Y tests inequality, pervasively.
X≠Y
1 2 3≠2 ⍝ 1x 0x 1x