MathGroup Archive 2012

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how to check for NumericQ arbitrary data structure

I have a data structure e.g. {a,{b,c},{d,{e,f},{g}}}, which I want to 
check for NumericQ. For vectors and matrices I can use
VectorQ[x,NumericQ] or MatrixQ[x,NumericQ]. Is there a way to check an 
arbitrary data structure that all elements are NumericQ or I have to 
construct a function for each data structure?
Thanks in advance,

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