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*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/markfirst_memberof.html).*
# Element Of (`∊`)
## `∊ 𝕩`: Unique Mask
Mark the first occurrence of each major cell in `𝕩` with a 1, and all other occurrences with a 0.
∊ 4‿5‿6‿6‿4‿7‿5
a ← 3‿3 ⥊ ↕9
∊ a
## `𝕨 ∊ 𝕩`: Member Of
Is each element in `𝕨` a major cell of `𝕩`?
⟨1⟩ ∊ ↕9
a ← 3‿3 ⥊ ↕9
⟨0‿1‿2⟩ ∊ a
⟨1‿3 ⥊ 0‿1‿2⟩ ∊ a
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