Pairing Merging and Encoding
*Pair_decode/Merge
nCombine two or more nodes
n    into a single node with more values.
nExplore different combinations
*Encode
nfull and partial encode
*Combine some i-sets
ncombine i-sets where those values
n    always appear together in fanouts.
mvsis> pair_decode
mvsis> merge
mvsis> encode
100 11 011 101  0
101 10 111 011  0
110 10 110 110  0
<default>          1
 a    b    c     d   x
100 11 011 101  0
101 10 111 011  0
<default>          1
 a    b    c     d   y
100 11 011 101  0
101 10 111 011  0
100 11 111 101  1
111 01 100 111  1
110 10 110 110  1
<empty>          2
 a    b    c     d   z
<default>         3
x0y0
x0y1
x1y0
x1y1
z0
z1
z2
z3
merge