ON A WING and a prayer. That was the spirit that bound five journalists when they plunged into the business of selling new and read books, says Inday Espina Varona, editor of the Philippine Graphic magazine. ?We?ve been talking about it. Usapang panaginip lang (dream talk),? she says of the bookshop they call ?Bound? that opened March 8 at 105-A Scout Castor St., in Quezon City.