This pseudocode is unambiguous if we know that the previous state of all the boxes is unchecked. Because we can't be sure of that in buggy code, a better model might be: […]

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The rest of the half-year is a jumble in my recollection of the daily strife and struggle of our lives; […] of the alternation of boiled beef with roast beef, and boiled mutton with roast mutton; of clods of bread-and-butter, dog’s-eared lesson-books, cracked slates, tear-blotted copy-books, canings, rulerings, hair-cuttings, rainy Sundays, suet-puddings, and a dirty atmosphere of ink, surrounding all.

On these two large islands [New Zealand], the native biota lacks many angiosperm and insect groups found routinely elsewhere, and the native flowers (about 80% endemic) are strongly dominated by rather dull white generalist forms, with flies, small moths, and beetles visiting: there are just a few bee- and bird-pollinated examples (visited mainly by bellbirds and tuis), and no native butterfly flowers.