  We study microlensing light curves by a triple lens, in particular, by a
primary star plus two planets. A four-fold degeneracy is confirmed in the light
curves, similar to the close and wide degeneracy found in a double lens.
Furthermore, we derive a set of equations for triple-lens in the external shear
approximation. By using these external shear equations, we identify two kinds
of continuous degeneracies which may confused double and triple lenses, i.e.
the continuous external shear degeneracy among triple-lens systems and the
double-triple lens degeneracy. These degeneracies are particularly important in
high magnification events, and thus some caution needs to be applied when one
infers the fraction of stars hosting multiple planets from microlensing. We
study the dependence of the degeneracies on the lensing parameters (e.g.,
source trajectory) and give recipes about how the degeneracies should be
explored with real data.
