Testing: in x y z
.x.
.y.
.z.
Testing: in u $empty v
.u.
.v.
Testing: in u " $empty" v
.u.
. .
.v.
Testing: in u $empty $empty$a v
.u.
.a.
.v.
Testing: in $a_b
.a.
.b.
Testing: in $*
.abc.
.d.
.e.
Testing: in $@
.abc.
.d.
.e.
Testing: in -$*-
.-abc.
.d.
.e-.
Testing: in -$@-
.-abc.
.d.
.e-.
Testing: in $a_b -$a_b-
.a.
.b.
.-a.
.b-.
Finished