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authorMarshall Lochbaum <mwlochbaum@gmail.com>2022-01-24 17:06:40 -0500
committerMarshall Lochbaum <mwlochbaum@gmail.com>2022-01-24 17:06:40 -0500
commitc9bc3e80280fd8a38f6297de80196dcbff9c28d9 (patch)
tree6be559af4ebeab26168836a8fb4d0b4734ecee85 /help/markfirst_memberof.md
parent3d78f125185ce47784245d6619f2878a6ad1b587 (diff)
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*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/markfirst_memberof.html).*
# Element Of (`∊`)
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## `∊ 𝕩`: Unique Mask
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Mark the first occurrence of each major cell in `𝕩` with a 1, and all other occurrences with a 0.
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∊ 4‿5‿6‿6‿4‿7‿5
a ← 3‿3 ⥊ ↕9
∊ a
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## `𝕨 ∊ 𝕩`: Member Of
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Is each element in `𝕨` a major cell of `𝕩`?
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⟨1⟩ ∊ ↕9
b ← 3‿3 ⥊ ↕9
@@ -25,5 +25,3 @@ Is each element in `𝕨` a major cell of `𝕩`?
⟨0‿1‿2⟩ ∊ b
⟨1‿3 ⥊ 0‿1‿2⟩ ∊ b
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