How many ( unique) times a number can be dialed ?

Let's say if you need to dial 912, it can be dialed as

(1) W1A, W1B, W1C X1A, X1B, Z1C, Y1A, Y1B, Y1C, Z1A, Z1B, Z1C

Let's say if you need to dial 6047, it can be dialed as

(2) M0GP, N0GP, O0GP M0HP, N0HP, O0HP M0IP, N0IP, N0IQ and so on....

Is there a way in SAS to code like this ( It's a combinations) ? 1 (one) & 0 (zero) are itself (it doesn't take any letters).

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