1<===> input.scss
2.thing {
3	color: black;
4}
5
6.a,
7.b,
8.c,
9.d,
10.e {
11	&:not(.thing) { @extend .thing; }
12}
13<===> output.css
14.thing, .a:not(.thing),
15.b:not(.thing),
16.c:not(.thing),
17.d:not(.thing),
18.e:not(.thing) {
19  color: black;
20}
21