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We study two dimensional $N=(4,4)$ supersymmetric gauge theories with various
gauge groups and various hypermultiplets in the fundamental as well as
bi-fundamental and adjoint represntations. They have ``mirror theories'' which
become equivalent to them at strong coupling. The theory with one fundamental
and one adjoint has a Higgs branch which is parametrized by the adjoint
matter. We also consider theories which involves an orientifold plane. The
brane realization of the Matrix theory formulation of NS 5-branes in Type II
string theories is also considered.
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