=> R1 = &43 (reason code)
R2 = 5 (sub reason code)
R3 = alphabet number
R4 = ASCII code of first character
R5 = ASCII code of last character
<= R1 = 0 to claim, preserved otherwise
This service defines a range of characters for a given alphabet number. If a module provides additional countries it should check this service - if the number matches one provided by the module it should claim this service, and call VDU 23 to define any characters in the range (R4-R5) inclusive defined in this alphabet.
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