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From Granier, go W towards Le Chapieu and then Boulissoir. N to Pierre Percée. Down to refuge de La Coire.
Day 2: Col du Coin, Col du Bresson, Col du Mont Rosset but if you have time take the Col de La Charbonnière which offers better views of Pierra Menta. Down to Granier: at Pré Pinet go to Plan des Archers then to Pont des Lanches in order not to miss Granier.