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Families
A family is a set of problems from unrelated fields that get stuck the same way — a sensor failing in a pasture and one failing on a buoy. 385 of the 613 problems in the collection belong to a family so far; the rest stand alone until a shape finds them. Each family is drawn with its own marks — kin families rhyme.
Each bar is one family across the collection’s releases, oldest on the left — the newest families begin part-way along. Sizes are printed at the end of each row.
In words: the largest family has grown from 10 problems in the earliest grouping to 92 today, across five releases.