Procedures:
D.4.5.1 blowup0 create presentation of blownup ring of ideal j D.4.5.2 elimRing create ring with block ordering for elimating vars in p D.4.5.3 elim variables .. eliminated from id (ideal/module) D.4.5.4 elim1 variables .. eliminated from id (different algorithm) D.4.5.5 elim2 variables .. eliminated from id (different algorithm) D.4.5.6 nselect select generators not containing variables given by v D.4.5.7 sat saturated quotient of ideal/module id by ideal j D.4.5.8 select select generators containing all variables given by v D.4.5.9 select1 select generators containing one variable given by v