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Permutation: The act of changing the arrangement of a given number of elements.
One font, two different brick combinations.
Picking any two bricks from the 169 available gives a total possible combinations of 14196 (169C2) different fonts. Counting a certain kinds of bricks as one--all four 45degree, for instance--gives 36 unique bricks, resulting in 630 (36C2) unique combinations or fonts.
In this font, if the bricks are swapped with each other, the result will be a different font. Hence order of the bricks matter. In which case, nCr (combinations) is not the right choice. What's needed is nPr (permutations). 169P2 gives 28392 permutations and a 36P2 gives 1260 permutations.
So, at a minimum, 1260 fonts are possible with the current implementation of FontStruct, with just this particular layout of bricks.