3. Grupul de litere incepe cu:

OT-19-A??OT-19-B??OT-19-C??OT-19-D??OT-19-E??OT-19-F??OT-19-G??OT-19-H??OT-19-I??
OT-19-J??OT-19-K??OT-19-L??OT-19-M??OT-19-N??OT-19-O??OT-19-P??OT-19-Q??OT-19-R??
OT-19-S??OT-19-T??OT-19-U??OT-19-V??OT-19-W??OT-19-X??OT-19-Y??OT-19-Z??