AA to BB or BB to AA: Ack, Chee, Eek
BB to DM or DM to BB: Oop, Eek, Ack
CC to BB or BB to CC: Oop, Ack, Eek
CC to GG or GG to CC: Ack, Oop, Chee
CC to AA or AA to CC: Ack, Chee, Oop
DM to AA or AA to DM: Eek, Ack, Oop
GG to AA or AA to GG: Ack, Oop, Eek