A Number Pyramid is composed of the 10 different numbers 0-9 with
a top row of 1 number resting on a second row of 2 sitting on a third row
of 3 supported by a bottom row of 4.  For example, a Number Pyramid
could be:
  
     0 
    1 2 
   3 4 5 
  6 7 8 9 
  
Given the clues below, can you determine the composition of Number
Pyramid 7?
 
-  The leftmost numbers in the four rows sum to 20.
 -  The two numbers in the second row of Number Pyramid 7 sum to 6.
 -  The leftmost number in row 4 minus the third number in row 4 equals 6.
 -  The two leftmost numbers in row 3 sum to the rightmost number in row 3.
 -  The rightmost number in row 2 minus the number at the apex of
Number Pyramid 7 equals 1.
 -  The rightmost number in row 4 minus the second number in row 4 equals 3.
  
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