PATTERN INDEX
; index    name of the picture
0 1.gif
1 2.gif
2 3.gif
3 4.gif

PATTERN MATCH
; blank1(cyan blank)  blank2(white blank)  middle  left  right  matches(0 means left, 1 means right)
0 1 2 2 3 0
0 1 2 3 2 1
0 1 3 2 3 1
0 1 3 3 2 0