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For a soft R like Four Weddings and a Funeral, which features a smattering of profanity, a theater might check identifications only lightly. But it will turn tough for a hard R like Oliver Stone's Natural Born Killers, one of the most violent movies of recent years.

The absence of slagginess and vesicularity in the considerable thickness exposed is also against its being a lava.

It was a bridge ybuilt in goodly wize, / With curious Corbes and pendants grauen faire, …