simple octagon tesselation by nn

D:let@a=3*@--2
@ai ##\x1bA \x1bo\x1b@ai#  \x1bA#\x1bYpVkky@-P@-PV5jd0iDjll\x1bU@al@all@a@.0kima\x16\x160r `akl\x1b\x160d@a@-@aj0ikmaYGp`a\x1b\x160d@a@-:%s/ *$/
ZZ

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