IFS with Memory
Combinations of Lines
The reason is that the picture doesn't contain these lines:
The tables reveal this as well.
The vertical line in the middle of the picture is made from both the
left
and
right
side vertical lines.
Because
1 → 4
and
3 → 4
are allowed, the
left
side line gives the
top
of the middle line.
Note
1 → 2
and
3 → 2
are forbidden, so the left side line does not give the bottom of the middle line.
Because
2 → 1
and
4 → 1
are allowed, the
right
side line gives the
bottom
of the middle line.
Note
2 → 3
and
4 → 3
are forbidden, so the right side line does not give the top of the middle line.
Return to
combinations of lines, 5
.