Status: IN
Counter from collections is the dominant abstraction in this repo for frequency counting, pair-counting, and multiset comparison, with its zero-default behavior, subtraction semantics, and filtering patterns consistently preferred over manual dict accumulation across the surveyed solutions.
Counter's built-in semantics eliminate boilerplate that manual dicts would require
Depends on (SL): counter-dominant-frequency-tool, counter-pattern-dominates-frequency-problems, counter-missing-key-returns-zero, counter-subtraction-drops-nonpositive