According to popular lore, medieval maps used to contain the warning “Here be dragons’’ to denote unknown and therefore dangerous territory. Perhaps a similar label should be affixed to Jaclyn Villano’s sharp-witted but lurid “The Company We Keep,’’ which makes “God of Carnage’’ look like a sedate game of bridge. As with “Carnage,’’ Villano’s new play features two pairs of upwardly mobile parents whose initially civil encounter steadily degenerates into nerve-shattering combat. But “Company’’ goes to further extremes, and its quartet of 40-something characters are not strangers but longtime friends.
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