Commentary for Kiddushin 33:3
אמר מר יכול אפילו חלה ת"ל ובשביעית יצא אפילו חלה כל שש והתניא חלה שלש ועבד שלש אינו חייב להשלים חלה כל שש חייב להשלים אמר רב ששת בעושה מעשה מחט
But it was taught: If he was sick three years and served three years , he is not bound to complete [his term]; but if he was ill the whole of the six years, he is bound to make it up! - R'Shesheth replied: This means that he was able to perform needle-work.<span class="x" onmousemove="('comment',' I.e., light work - then he is not bound to complete his term. - Krauss, T.A. 1, 159 translates: Schneiderhandwerk, hand tailoring.');"><sup>3</sup></span> This is self-contradictory. You say: 'If he was sick three years and served three years, he is not bound to complete [his term]': which implies, if four years he must complete [it].