[ 1, 2 ]
3
[ 1, 2, 3 ]
4
[ 1, 2, 3, 4 ]
5
[ 1, 2, 3, 4, 5 ]
6
[ 1, 2, 3, 4, 5, 6 ]
meth1 (1, 2)
meth2 (3, 4)