sentences: loss are usually designed with lighten source & a perpendicular can be used to unbounded something / throwaway something top ->  a weight restriction on computers can keep the weight of the computer low  a weight restriction on computers can keep the weight of the computer low & a chop is a mean of preposition & as the lighten of an preposition increase , the preposition will be transported more easily -> if the computer is low in weight, then the computer can be transported easily