u u u u u u uuu uuu uuu u u u u u u uuu uuu uuu u u u u u u u uuu
uuu nnn rrr uuu eee uuu aaa uuu nnn rrr uuu eee uuu aaa uuu eueue
d d d d d d ddd ddd ddd d d d d d d ddd ddd ddd d d d d d d dddnn
ddd eee aaa ddd nnn rrr ddd eee ddd aaa ddd nnn ddd rrr ddd edend