AM Twenty and odd years ago in Calcutta's labyrinthine lanes and by-lanes, there was one chant which would drown all others: tomar nam, amar nam, Vietnam, Vietnam. Vo Nguyen Giap, Ho Chi Minh's comrade-general, the one who had planned and executed the miracle of Dien Bien Phu, was in Calcutta the other day, for a couple of fleeting hours, but he came twenty years too late. It is a different city he visited from the Calcutta of twenty and odd years ago. Perhaps it is also a different Vietnam from where he was visiting.