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I find myself using {.@E. quite often.
x {.@E. y means sequence y starts with sequence x.
likewise, x {.@E.&.|. y means y ends with sequence x.
As far as I can tell, this is not a special combination, but I would like it to be, as otherwise it needlessly finds all occurrences of x in y.
(I would expect to find it under FLO/fast list operations.)