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Square Original Of or Equal To (⊒)
⊒ 𝕩: Occurrence Count
Number of times each major cell of 𝕩 has occurred before the current position.
⊒ 2‿7‿1‿8‿1‿7‿1‿8‿2‿8‿4
≍⟜⊒ 2‿7‿1‿8‿1‿7‿1‿8‿2‿8‿4
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, the length of 𝕨 is placed in that position.
"aaa" ⊒ "aaaaa"
"aaabb" ⊒ "ababababab"