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Working with strings


I have a list of string characters that I would like to group in a
particular way. The list has the following structure:

{n UpperCase Characters, x, m UpperCase Characters}

Here is an example:

myString={"S", "T", "M", "x", "R", "K", "P", "G"}

Now I would like to form the following groupings:

{"SxR", "SxK", "SxP", "SxG", "TxR", "TxK", "TxP", "TxG", "MxR", "MxK",
"MxP", \
"MxG"}

A brute force way of doing this is

subString[n_] := Split[myString, UpperCaseQ[#2] && UpperCaseQ[#1]
&][[n]];

Flatten[Outer[StringJoin, Outer[StringJoin, subString[1],
subString[2]],
    subString[3]]]

Does anyone have any elegant way of doing this with perhaps using
replacement rules?

Thanks much,


Brian


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