Responsa for Bava Batra 276:6

וחכמים אומרים אין צריך ליקח לו דרך ומודה ר"ע בזמן שאמר לו חוץ מאלו שאינו צריך ליקח לו דרך

said to him, 'except these',<span class="x" onmousemove="('comment',' Cistern and cellar. ');">¹⁴</span> he need not buy a passage for himself.<span class="x" onmousemove="('comment',' It was not necessary for the seller to specify, 'except these', if he wished to retain the cistern and the cellar only, since these are implicitly excluded from the sale. The addition of, 'except these', is, therefore, taken to imply the exclusion from the sale of the path that leads to them. ');">¹⁵</span> From this it clearly follows [that] where [a person] mentioned [that] which was not necessary, his object was<span class="x" onmousemove="('comment',' Lit., 'he comes'. ');">¹⁶</span>

Teshuvot Maharam