4 4  ## unordered bitrades of size 8
abcd badc
badc abcd
```` ````
```` ````

abcd bcda
bcda abcd
```` ````
```` ````

abcd badc
ba`` ab``
``dc ``cd
```` ````

abc` bca`
dca` adc`
bd`` db``
```` ````

ab`` ba``
ba`` ab``
``cd ``dc
``dc ``cd

Generated 5 bitrades from 5 
A complete list.