that which grows in gravel is subject to be frow, as they term it , and brittle

Just as a monoid consists of an underlying set with a binary operation on top of it which is closed, associative and with an identity, a category consists of an underlying digraph with an arrow composition operation on top of it which is transitively closed, associative, and with an identity at each object. In fact, a category's composition operation, when restricted to a single one of its objects, turns that object's set of arrows (which would all be loops) into a monoid.

I do find Valentine's Day slightly irritating, however, in the sense that single people seem encouraged to be depressed and couples jubilant. It is possible to be in a shitty relationship and to be happily by yourself. OK, those for whom the former is applicable may get to do Valentinesy things, but they've got to stick the rest of the year together.

For example, Mandarin uses the suffix ɚ < ér 兒 'son' while Cantonese employs tone sandhi, changing the citation tone to high rising tone, the cheshirization of an earlier segmental morpheme meaning 'son'.