abdc
abdd
acdd
acad
acaa
acab
acac
acad
acbd
acba
acbb
acbc
acbd
accd
acca
accb
accc
accd
acdd
acda
acdb
acdc
acdd
addd
adad
adaa
adab
adac
adad
adbd
adba
adbb
adbc
adbd
adcd
adca
adcb
adcc
adcd
addd
adda
addb
addc
addd
bddd
badd
baad
baaa
baab
baac
baad
babd
baba
babb
babc
babd
bacd
baca
bacb
bacc
bacd
badd
bada
badb
badc
badd
bbdd
bbad
bbaa
bbab
bbac
bbad
bbbd
bbba
bbbb
bbbc
bbbd
bbcd
bbca
bbcb
bbcc
bbcd
bbdd
bbda
bbdb
bbdc
bbdd
bcdd
bcad
bcaa
bcab
bcac
bcad
bcbd
bcba
bcbb
bcbc
bcbd
bccd
bcca
bccb
bccc
bccd
bcdd
bcda
bcdb
bcdc
bcdd
bddd
bdad
bdaa
bdab
bdac
bdad
bdbd
bdba
bdbb
bdbc
bdbd
bdcd
bdca
bdcb
bdcc
bdcd
bddd
bdda
bddb
bddc
bddd
cddd
cadd
caad
caaa
caab
caac
caad
cabd
caba
cabb
cabc
cabd
cacd
caca
cacb
cacc
cacd
cadd
cada
cadb
cadc
cadd
cbdd
cbad
cbaa
cbab
cbac
cbad
cbbd
cbba
cbbb
cbbc
cbbd
cbcd
cbca
cbcb
cbcc
cbcd
cbdd
cbda
cbdb
cbdc
cbdd
ccdd
ccad
ccaa
ccab
ccac
ccad
ccbd
ccba
ccbb
ccbc
ccbd
cccd
ccca
cccb
cccc
cccd
ccdd
ccda
ccdb
ccdc
ccdd
cddd
cdad
cdaa
cdab
cdac
cdad
cdbd
cdba
cdbb
cdbc
cdbd
cdcd
cdca
cdcb
cdcc
cdcd
cddd
cdda
cddb
cddc
cddd
dddd
dadd
daad
daaa
daab
daac
daad
dabd
daba
dabb
dabc
dabd
dacd
daca
dacb
dacc
dacd
dadd
dada
dadb
dadc
dadd
dbdd
dbad
dbaa
dbab
dbac
dbad
dbbd
dbba
dbbb
dbbc
dbbd
dbcd
dbca
dbcb
dbcc
dbcd
dbdd
dbda
dbdb
dbdc
dbdd
dcdd
dcad
dcaa
dcab
dcac
dcad
dcbd
dcba
dcbb
dcbc
dcbd
dccd
dcca
dccb
dccc
dccd
dcdd
dcda
dcdb
dcdc
dcdd
dddd
ddad
ddaa
ddab
ddac
ddad
ddbd
ddba
ddbb
ddbc
ddbd
ddcd
ddca
ddcb
ddcc
ddcd
dddd
ddda
dddb
dddc
dddd