3. Grupul de litere incepe cu:

AB-78-A??AB-78-B??AB-78-C??AB-78-D??AB-78-E??AB-78-F??AB-78-G??AB-78-H??AB-78-I??
AB-78-J??AB-78-K??AB-78-L??AB-78-M??AB-78-N??AB-78-O??AB-78-P??AB-78-Q??AB-78-R??
AB-78-S??AB-78-T??AB-78-U??AB-78-V??AB-78-W??AB-78-X??AB-78-Y??AB-78-Z??