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Unique major cells of 𝕩.
⍷ 4‿5‿6‿6‿4‿7‿5
a ← 3‿3 ⥊ ↕6
⍷ a
Mark the top left location of the occurrences of 𝕨 in 𝕩 with a 1, and other locations with 0.
Result is the same shape as (≢𝕨)↕𝕩.
"string" ⍷ "substring"
"loooooong" ⍷ "short"
b ← 7 (4|⋆˜)⌜○↕ 9
c ← (0‿3‿0≍0‿1‿0)
c ⍷ b