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(1..17);
(25..42);
(44..50);

m = 12;
n = 62;

(12..17);   # sublist of the 1st list
(18..24);   # gap-filling list
...
(43);       # gap-filling list
(44..50);   # entirety of the 3rd list
(51..62);   # integers needed above highest list