It's been pointed out that this only works for 5.8

$_=unpack'B*',pack'N*',7516444,364737028,1746469154;#      ~  ~
tr[1][2];print+sort{-1+chop}'aaceeehhJklnoprrrsttu   '=~m|(.)(.)|g;
#                                                            \
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Update: This version works on 5.6.1 .

$_=unpack'B*',pack'N*',534308,1499842816,4101233933;#      \  /
tr[1][2];print+sort{-1+chop}'aaceeehhJklnoprrrsttu   '=~m{(.)(.)}g;
#                                                            J
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