varx, 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,以後は変数の現れた順.
[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
ord, section vars.
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