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There are exactly 42 Incan letters.
There are 24.
40 is nearest to 39 and is exactly by divisible 4
4*4*4 = 64 ways.
-- 893 of them have no 4's. -- Three of them have exactly one 4: 4xx, x4x, and xx4. -- Three of them have exactly 2 4's: 44x, 4x4, and x44. -- One of them has exactly three 4's: 444. -- None has more than three 4's.