-- -*- M2-comint -*- hash: -1093459974

i1 : B = skewPolynomialRing(QQ,(-1)_QQ,{x,y,z,w})
--Calling Bergman for NCGB calculation.
Complete!

o1 = B

o1 : NCQuotientRing

i2 : sigma = ncMap(B,B,{y,z,w,x})

o2 = NCRingMap B <--- B

o2 : NCRingMap

i3 : C = oreExtension(B,sigma,a)
--Calling Bergman for NCGB calculation.
Complete!

o3 = C

o3 : NCQuotientRing

i4 : 
