###
FF:
1
2
 /FF

X, Y : 1 2

###
FF:
3
4
 /FF

X, Y : 3 4

X[0]="1"
X[1]="3"
Y[0]="2"
Y[1]="4"
FF[0]="1\
2\
"
FF[1]="3\
4\
"