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*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/⊒occcount progindex.html).*
# Square Original Of or Equal To (`⊒`)
`⊒ 𝕩`: Occurrence Count
Number of times each major cell of `𝕩` appears before itself.
⊒ 2‿7‿1‿8‿1‿7‿1‿8‿2‿8‿4
⟨ 0 0 0 0 1 1 2 1 1 2 0 ⟩
≍⟜⊒ 2‿7‿1‿8‿1‿7‿1‿8‿2‿8‿4
┌─
╵ 2 7 1 8 1 7 1 8 2 8 4
0 0 0 0 1 1 2 1 1 2 0
┘
`𝕨 ⊒ 𝕩`: Progressive Index Of
Index of the first unused match of each major cell of `𝕩` in `𝕨`. If there are no more matches left, length of `𝕨` is placed in that position.
"aaa" ⊒ "aaaaa"
⟨ 0 1 2 3 3 ⟩
"aaabb" ⊒ "ababababab"
⟨ 0 3 1 4 2 5 5 5 5 5 ⟩
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