Re: [csswg-drafts] [css-nesting] Concern about combinatorial explosion

The innermost rule desugars down to:

`:matches(:matches(:matches(:matches(:matches(a1, a2) b, b :matches(a1, a2)) c, c :matches(:matches(a1, a2) b, b :matches(a1, a2))) d, d:matches(:matches(:matches(a1, a2) b, b :matches(a1, a2)) c, c :matches(:matches(a1, a2) b, b :matches(a1, a2)))) e, e :matches(:matches(:matches(:matches(a1, a2) b, b :matches(a1, a2)) c, c :matches(:matches(a1, a2) b, b :matches(a1, a2))) d, d:matches(:matches(:matches(a1, a2) b, b :matches(a1, a2)) c, c :matches(:matches(a1, a2) b, b :matches(a1, a2))))) f, f:matches(:matches(:matches(:matches(:matches(a1, a2) b, b :matches(a1, a2)) c, c :matches(:matches(a1, a2) b, b :matches(a1, a2))) d, d:matches(:matches(:matches(a1, a2) b, b :matches(a1, a2)) c, c :matches(:matches(a1, a2) b, b :matches(a1, a2)))) e, e :matches(:matches(:matches(:matches(a1, a2) b, b :matches(a1, a2)) c, c :matches(:matches(a1, a2) b, b :matches(a1, a2))) d, d:matches(:matches(:matches(a1, a2) b, b :matches(a1, a2)) c, c :matches(:matches(a1, a2) b, b :matches(a1, a2)))))`

The higher rules desugar to subsets of that.

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