with 12 on the last one, 51 is really impressive.
reasonably:
the 1,2,3,4,5,6,9,12,13,18 in one
the 11,14,16,17 in two
the 7,8,10,15 in three.
so, the perfect score would be 30. nearly impossible. but less than 40 could be done.
16th and 18th can be horrible though![]()

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