ID: 4.0	Parent: 0.0	Tree
Exchanged to: 17.0 4<->x1^4+2*x1^2*x2^2+x2^4+2*x1^2*x3^2+2*x2^2*x3^2+x3^4-2*x1^2-2*x2^2-2*x3^2-x4^2+1
PDER	VAR\IND x1 x2 x3 x4 x1 1 0 0 0 x2 0 1 0 0 x3 0 0 1 0 x4 0 0 0 1 x6 0 0 0 -x6^2
FOCUS
	(x1^2+x2^2+x3^2-1)^2*x4^2-x4^4
	2*x1
	2*x2
	2*x3
DEP
	x6*x4-1
MAP	x1 x1 x2 x2 x3 x3 x4 x4
IMAP	x1 x1 x2 x2 x3 x3 x4 x4 x6 1/x4
STACK
WBO (dim: 4)
J
	(x1^2+x2^2+x3^2-1)^2*x4^2-x4^4	1
c	1
N	empty
(E,a)	empty
C	empty
TBO (dim: 4)
J
	(x1^2+x2^2+x3^2-1)^2*x4^2-x4^4	1
N	empty
E	empty
EM	empty
C	empty
SBO (dim: 4)
J
	(x1^2+x2^2+x3^2-1)^2*x4^2-x4^4	1
N	empty
H	empty
E	empty
C	empty
Exchanged to: 17.0 4<->x1^4+2*x1^2*x2^2+x2^4+2*x1^2*x3^2+2*x2^2*x3^2+x3^4-2*x1^2-2*x2^2-2*x3^2-x4^2+1
ID: 4.0	Parent: 0.0	Tree