CSS Test Reference: breaking of a multicolumn

AAAAA
BBBBB
CCCCC
DDDDD
EEEEE

FFFFF
GGGGG
HHHHH
IIIII
JJJJJ

KKKKK
LLLLL
MMMMM
NNNNN
OOOOO

PPPPP
QQQQQ
RRRRR
SSSSS
TTTTT

UUUUU
VVVVV
WWWWW
XXXXX
YYYYY

ZZZZZ
aaaaa
bbbbb
ccccc
ddddd