static const int maxtr = 6;
static const int nv_opt[6][2][3] = {
{{4,2,-1},{2,1,1}},
{{5,2,-1},{2,1,1}},
{{5,2,-1},{5,2,2}},
{{5,2,-1},{5,2,2}},
{{5,2,-1},{5,2,2}},
{{5,2,-1},{5,2,2}}
};