since -> single

Thanks to Danny
https://stacks.math.columbia.edu/tag/02S0#comment-7774

chow.tex

@@ -3212,7 +3212,7 @@ \section{Rational equivalence and push and pull}
 is equal to $i'_{j, *}\text{div}(g_j)$ for some $g_j \in R(W'_j)^*$.
 
 \medskip\noindent
-The arguments above therefore reduce us to the case of a since
+The arguments above therefore reduce us to the case of a single
 integral closed subscheme $W \subset X$ of $\delta$-dimension $k + 1$.
 Let $f \in R(W)^*$. Let $W' = p(W)$ as above.
 We get a commutative diagram of morphisms