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VALUES
a b c
...
c1x c1y c1z   c1
c2x c2y c2z   c2
c3x c3y c3z   c3 c

#!/usr/bin/perl -w
use strict;
...
b2x7 b2x8 b2x9         b2y7 b2y8 b2y9         b2z7 b2z8 b2z9
c1x7 c1x8 c1x9         c1y7 c1y8 c1y9         c1z7 c1z8 c1z9
c2x7 c2x8 c2x9         c2y7 c2y8 c2y9         c2z7 c2z8 c2z9

#!/usr/bin/perl -w
use strict;
...
b2x7 b2x8 b2x9   b2x   b2y7 b2y8 b2y9   b2y   b2z7 b2z8 b2z9   b2z b2 
+b
c1x7 c1x8 c1x9   c1x   c1y7 c1y8 c1y9   c1y   c1z7 c1z8 c1z9   c1z c1
c2x7 c2x8 c2x9   c2x   c2y7 c2y8 c2y9   c2y   c2z7 c2z8 c2z9   c2z c2 
+c