P f v

P f vP f vP f vP f vP f vP f v
P f vP f vP f vP f vP f vP f v
P f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f vP f v