Complementary group technique leads to more simple solutions of some problems considered by F. Pan [J. Math. Phys. 31, 1333 (1990)], including special resubducing coefficients and isoscalar factors of unitary groups.

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An alternative construction of the projected U4⊃U2×U2 basis, and the representation of generators and labeling operators have been proposed by B. A. Knyr, Yu. F. Smirnov, and V. N. Tolstoy in Group-Theoretical Methods in Physics, Proceedings of the International Seminar Zvenigorod 1979 (Nauka, Moscow, 1980), Vol. 1, p. 34 (in Russian).
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