## {4,7}, square 1F + square 1F, solution 6
h2.
angleunit(2*pi/7)
# the line below lets us specify internal angles
angleofs(pi)
distunit(edge(4,7))
unittile(1,1,1,1)
unittile(1,1,1,1)
# the Conway notation
conway("(0)(1 0')(2)[3 1'](2' 3')")
sublines(1)