d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop
d double u: drop