apple
cherry
kiwi
banana
orange

Dual combo:

appleapple
applecherry
applekiwi
applebanana
appleorange
cherryapple
cherrycherry
cherrykiwi
cherrybanana
cherryorange
etc.

Triple combo:

appleappleapple
appleapplecherry
appleapplekiwi
appleapplebanana
appleappleorange
applecherryapple
applecherrycherry
applecherrykiwi
applecherrybanana
applecherryorange
applekiwiapple
applekiwicherry
etc.