...(rows)
in a 2D system. In 3D we add extra planes.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
© 1997 Boris Veytsman and Michael Kotelyanskii
Thu Nov 6 22:32:26 EST 1997