| #### D.12.4.2 tail Procedure from library `teachstd.lib` (see teachstd_lib). Usage: tail(f); f poly or vector Return: f-lead(f), the tail of f of type poly Example:
    LIB "teachstd.lib";
    ring r=0,(x,y,z),ls;
    tail((y+z+x+xyz)**2);
    ==> 2yz+y2+2xz+2xy+2xyz2+2xy2z+x2+2x2yz+x2y2z2
    ring s=0,(x,y,z),dp;
    tail((y+z+x+xyz)**2);
    ==> 2x2yz+2xy2z+2xyz2+x2+2xy+y2+2xz+2yz+z2

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