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.

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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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.