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Coupling
is
the
enemy
of
change,
because
it
links
together
things
that
must
change
in
parallel.
This
makes
change
more
difficult:
either
you
spend
time
tracking
down
all
the
parts
that
need
changing,
or
you
spend
time
wondering
why
things
broke
when
you
changed
"just
one
thing"
and
not
the
other
things
to
which
it
was
coupled.
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