text to number 2

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ok,  I have reviewed the value library function for converting a 
sequence to a number,  but how do you get a sequence like 
{"-","1","2",".","2"}  to be {"-12.2"} as the function needs it to be?  
Or am I missing something obvious?  I need to make a file filter and I 
need to be able to convert back and forth regularly from string to 
numeric.

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