useful functionsuseful inflow or effective inflow or effective inflowuseful lifeuseful loaduseful starting pointusefullusefullnessusefullyusefulnessusefulness utilityuselessuseless as a fifth wheeluseless as an ashtray on a motorbikeuseless as tits on a boar hoguseless as tits on a bulluseless as tits on a nunuseless paperuseless personuselesslyuselessnessusenetusepauseruser agentuser baseuser baseduser centereduser centric positioninguser characteristicsuser datauser data packetuser data signalling rate user data signaling rateuser datagram protocoluser defineduser defined functionuser dialling state user dialing stateuser drivenuser experienceuser experience programuser facinguser feeuser flowuser freindlyuser friendlinessuser friendlyuser friendly interfaceuser friendly softwareuser guideuser iduser identification
