`var'
-----

var(RAT)
     :: RAT $@$N<gJQ?t(J.

RETURN
     $@ITDj85(J
RAT
     $@M-M}<0(J

   * $@<gJQ?t$K4X$7$F$O(J, *Note Asir $@$G;HMQ2DG=$J7?(J::.
   * $@%G%U%)%k%H$NJQ?t=g=x$O<!$N$h$&$K$J$C$F$$$k(J.

     `x', `y', `z', `u', `v', `w', `p', `q', `r', `s', `t', `a', `b',
     `c', `d', `e', `f', `g', `h', `i', `j', `k', `l', `m', `n', `o',
     $@0J8e$OJQ?t$N8=$l$?=g(J.

     [0] var(x^2+y^2+a^2);
     x
     [1] var(a*b*c*d*e);
     a
     [2] var(3/abc+2*xy/efg);
     abc

$@;2>H(J
     `ord', `vars'

