Create a Martix indexed by strings ?

Revision en1, by MMM24, 2015-06-22 19:12:28 
How to create a Matrix indexed by strings ex( m["abc"]["xyz"]=1 ) .
I google about it and all i can find is array indexed by string .

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en1 English MMM24 2015-06-22 19:12:28 190 Initial revision (published)