How do you beat level 11 on dublox

You have to cross the "fragile bridges" (cannot put all four parts of the block on them). There are 2 variations with the same number of moves.
The 21 moves are:
A) up right down left up
right right right right right
right up right down left
up up right down left
up
U R D L U R6
U R D L U2 R D L U
B) up left down right up
up left down right up
right right right right right
right up right down left
up
U L D R U2 L D R U
R6 U R D L U
* note that the same 5 moves (URDLU) are used in both: once then twice in the first variation / once after ULDRU, then once more in the second variation.