.theme-name-1, .theme-lastname-1,
.theme-name-2, .theme-lastname-2,
.theme-name-3, .theme-lastname-3 {
....
}
@mixin column-type($name, $number) {
@for $i from 1 through $number {
.col-#{$name}-#{$i} {
color: red;
}
}
}