args before: [[]]
[args were not changed]
result: undefined

args before: [["cdef","abcxyz","abcmnop"]]
[args were not changed]
result: undefined

args before: [["cdef","cdef","cdef"]]
args after: [["","",""]]
result: undefined

args before: [["abcdefnop","abcxyznop","abcmnop","abcdefnop"]]
args after: [["defnop","xyznop","mnop","defnop"]]
result: undefined

args before: [["abcdef","abcxyz","aabcmnop","abcdef","abcxyz"]]
args after: [["bcdef","bcxyz","abcmnop","bcdef","bcxyz"]]
result: undefined

args before: [["abcdef","abcxyzf","abcmnopf","abcdef","abcxyzf","abcmnopf"]]
args after: [["def","xyzf","mnopf","def","xyzf","mnopf"]]
result: undefined

args before: [["abcdef","abcxyz","abcmnop","abcdef","abcxyz","abcmnop","dabcdef"]]
[args were not changed]
result: undefined

args before: [["abcdef"]]
[args were not changed]
result: undefined