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lasto: x is the final element of l. Direct base case (l = (x)) plus recurse-on-cdr. init-o: init is l without its last element. Base case for singleton: (== init ()). Otherwise recurse, threading the head through to the init result via conso. Together with appendo, the round-trip init append (list last) = l holds, which is exercised by an end-to-end test. 8 new tests, 344/344 cumulative.