`gr', `grm', `hgr', `hgrm'
--------------------------

gr(PLIST,VLIST)
grm(PLIST,VLIST)
hgr(PLIST,VLIST)
hgrm(PLIST,VLIST)
     :: ֥ʴη׻

RETURN
     ꥹ
PLIST, VLIST
     ꥹ

   * ɸ饤֥ `gr' Ƥ.
   * , ¿༰ꥹ PLIST , ѿ VLIST ˴ؤ륰֥
     .
   * VLIST 긵Υꥹ. VLIST ˸ʤ긵, Τ°
     ȸʤ.
   * `grm()', `hgrm()' ϥ⥸黻Ѥ®, `hgr()' `hgrm()' 
     ƼѤ경Ԥ.
   * ѿ, ѿ `Ord' ͤѤ.
   * ͭ¸Ĥȿ¬ˤ, `grm()', `hgrm()' ͭ.

     [0] load("gr")$
     [44] Ord=2$
     [45] load("cyclic")$
     [55] P=cyclic(5);        
     [c4*c3*c2*c1*c0-1,(((c3+c4)*c2+c4*c3)*c1+c4*c3*c2)*c0+c4*c3*c2*c1,
     ((c2+c4)*c1+c4*c3)*c0+c3*c2*c1+c4*c3*c2,(c1+c4)*c0+c2*c1+c3*c2+c4*c3,
     c0+c1+c2+c3+c4]
     [56] G=grm(P,[c0,c1,c2,c3,c4]);
     [c0+c1+c2+c3+c4,...]


     `Ord'

