(abc)(b-ac) #### (cb-a)(bca) #### (bc) #### (cb) #### (-a-b-c-d)(-c-da-b) #### (-b-c-d)
## (cb-a)(bca) ##
## (bc) ##
## (cb) ##
## (-a-b-c-d)(-c-da-b) ##
## (-b-c-d)