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## Matlab, 177 bytes

Generate a binary matrix withdefining all allowed pairs of letters, reshape it and base-64 encode it. The base-64 encoded string ('CR+ ... % ') is used as data in the program. The program reverses operations to unpack the matrix, and then reads the combinationsallowed pairs:

x=de2bi('CR+"''        1$$L*\"%!! ! !04P@100@RZP4  $$0 ! 1$$$$1 0 P (  0 0 ! # % '-32)';[i,j]=find(reshape(x(1:650),26,[])');char([j i]+64)  ## Matlab, 177 bytes Generate a matrix with all allowed pairs of letters, reshape it and base-64 encode it. The base-64 encoded string ('CR+ ... % ') is used as data in the program. The program reverses operations and reads the combinations: x=de2bi('CR+"'' 1$$L*\"%!! ! !04P@100@RZP4 $$0 ! 1$$$$1 0  P (    $0 0$ ! # %  '-32)';[i,j]=find(reshape(x(1:650),26,[])');char([j i]+64)


## Matlab, 177 bytes

Generate a binary matrix defining all allowed pairs of letters, reshape it and base-64 encode it. The base-64 encoded string ('CR+ ... % ') is used as data in the program. The program reverses operations to unpack the matrix, and then reads the allowed pairs:

x=de2bi('CR+"''        1$$L*\"%!! ! !04P@100@RZP4  $$0 ! 1$$$$1 0 P (  0 0 ! # % '-32)';[i,j]=find(reshape(x(1:650),26,[])');char([j i]+64)  1 ## Matlab, 177 bytes Generate a matrix with all allowed pairs of letters, reshape it and base-64 encode it. The base-64 encoded string ('CR+ ... % ') is used as data in the program. The program reverses operations and reads the combinations: x=de2bi('CR+"'' 1$$L*\"%!! ! !04P@100@RZP4 $$0 ! 1$$$$1 0  P (    $0 0$ ! # %  '-32)';[i,j]=find(reshape(x(1:650),26,[])');char([j i]+64)