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Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.
for completeness, to go with strict 2-category and (2,1)-category
added pointer to:
for the terminology “track category”
Also copied over refereces from Toda bracket which discuss Toda brackets in the homotopy 2-category, regarded as a strict $(2,1)$-category, hence “track category”.
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