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The Trittico di Autunno "(Autumn Triptych)" is an unofficial trio of cycling classics held in the Lombardy and Piedmont regions of Northern Italy, in early October. Three one-day races, Milano–Torino, the Giro del Piemonte (Tour of Piedmont) and the Tour of Lombardy, are held within a four-day timeframe in the week following the World Championship. Milan-Turin is held on the Thursday after the World Championship, the Giro del Piemonte on Friday and the Tour of Lombardy is the closing race on Sunday. The Tour of Lombardy is the pinnacle, the hardest and unequivocally most important race of this unofficial trio.