new/2002-05, ranked <=6

up
Image series selection:
9 (0)>=8 (0)>=7 (1)>=6 (2)>=5 (11)all (11)
all (11)<=8 (11)<=7 (11)«<=6 (10)»<=5 (9)4 (0)
9 (0)
good3
8 (0)
good2
7 (1)
good1
6 (1)
ok
5 (9)
mediocre
4 (0)
bad

fluid motion in a toilet tank