You could use a CSS Pre-processor like SASS or LESS, with variables.
For example, with SASS you could do a for loop:
$class-slug: select !default
@for $i from 1 through 100
.#{$class-slug}-#{$i}
padding: $i + 0em
Which would output what you're looking for.
It's not a pure CSS solution, but it beats doing each one by hand. Otherwise you could also do this with Javascript, but that's not ideal.
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