3. Grupul de litere incepe cu:

OT-30-A??OT-30-B??OT-30-C??OT-30-D??OT-30-E??OT-30-F??OT-30-G??OT-30-H??OT-30-I??
OT-30-J??OT-30-K??OT-30-L??OT-30-M??OT-30-N??OT-30-O??OT-30-P??OT-30-Q??OT-30-R??
OT-30-S??OT-30-T??OT-30-U??OT-30-V??OT-30-W??OT-30-X??OT-30-Y??OT-30-Z??