ipl/data/abc.csg


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#   a(n)b(n)c(n)
#   Salomaa, p. 11.
#   Attributed to M. Soittola.
#
X->abc
X->aYbc
Yb->bY
Yc->Zbcc
bZ->Zb
aZ->aaY
aZ->aa
X:10