Procedures:
D.4.6.1 blowup0 create presentation of blownup ring of ideal j D.4.6.2 elimRing create ring with block ordering for elimating vars in p D.4.6.3 elim variables .. eliminated from id (ideal/module) D.4.6.4 elim1 variables .. eliminated from id (different algorithm) D.4.6.5 elim2 variables .. eliminated from id (different algorithm) D.4.6.6 nselect select generators not containing variables given by v D.4.6.7 sat saturated quotient of ideal/module id by ideal j D.4.6.8 select select generators containing all variables given by v D.4.6.9 select1 select generators containing one variable given by v