(
a
b
)
4
=
(
a
b
)
(
a
b
)
(
a
b
)
(
a
b
)
=
(
a
b
)
·
(
a
b
)
·
(
a
b
)
·
(
a
b
)
=
a
·
a
·
a
·
a
b
·
b
·
b
·
b
=
a
4
b
4
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