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It’s been ages since we’ve had a regular pizza night, but this summer we found a good reason to return to old habits. The motivation is provided by Ristorante Olivio in Arlington (across from the Capitol Theatre), where a summer-long promotion brings two 10-inch pies with two 12-ounce beers Mondays from 5 to 9:30 p.m., all for the throwback price of $20. Owned since 2002 by Angelo DiGirolamo, Olivio offers a superlative Neapolitan-style thin crust pizza, and the ambience is part cozy local hangout, part Hanover Street.