Reference for Eruvin 114:2

אי רבי מאיר היא הא תני ליה רישא נותנין קרפף לעיר דברי רבי מאיר

But if this is the view of R'Meir [the objection arises:] Was it not already enunciated in the first clause: A KARPAF IS ALLOWED FOR EVERY TOWN; SO R'MEIR? - [Both were] required. For if [the law were to be derived] from the former only it might have been presumed that one karpaf is allowed for one town and one is also allowed for two towns,<span class="x" onmousemove="('comment',' The purpose of the ruling being that every town shall have a karpaf but not one exclusively for itself.');">⁴</span> hence we were informed<span class="x" onmousemove="('comment',' By the final clause.');">⁵</span>

Jastrow