‘X’ contracts with ‘Y’ to purchase 30 chairs of a particular brand called make and type. ‘Y’ delivers 15 chairs of that quality and 15 chairs of some other make - download a 4shared. ‘X’ contracts with ‘Y’ to purchase 30 chairs of a particular brand called make and type. ‘Y’ delivers 15 chairs of that quality and 15 chairs of some other make è ospitata presso il servizio di condivisione gratuita di file 4shared.