comparing kit names

Hi,

I have these type of kits in unix location.

aaa.t.z aaa_d.t.z bbb.t.z bbb_d.t.z ccc.t.z ccc_d.t.z ddd.t.z eee.t.z
(there will be more numbers).

I have to come up with idea, so that ,
it compares for each *.t.z kit in that location, that it has the
corresponding *_d.t.z. If any *.t.z doesn't have corresponding
*_d.t.z, it will print out the list of that/those kit/kits. In this
case, it should print out:

ddd.t.z eee.t.z

Currently I am putting the kit list in an array, still not able to
compare them correctly. Any help suggestion will be appriciated.

Thanks!