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To do this , parents carrying different ALS alleles were used . Half-seminars carry 2 units and are normally taken for a S / U grade only , except that arrangements may be made with the instructor beforehand , at the instructor 's discretion , for a letter grade to be given . While " transnational cultures are penetrable to various degrees by the local meanings carried in settings and by participants in particular situations " ( p. 251 ) , they also provide points of contact between different territorial cultures . A year later on the same turf , USC 's defense absolutely suffocated Michigan running back Mike Hart ( 17 carries for 47 yards , 44 below his previous season low ) and pressured quarterback Chad Henne into six sacks and a pair of turnovers . As a parent of three future college students , one burden I carry is that many parents do not realize the type of environment they are placing their kids in . The fact that in the past I carried an assault rifle does n't imply that I carry one now and intend to use it irrationally .