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 A standard validity check is to see that the resulting generating
function simplifies to the correct univariate generating function. 
The first few coefficients at 
dx = 1, y = 1 
agree with the above generating function.  The univariate generating
function in 
dt 
t
  is a generating function in terms of the length of the sequence.
 
 
 
 
 
 
 
 
 Compare this with the expansion  
dg 
g
 .
 
 
 
 
 
 
  
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