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Currently , she is focused on four areas : " cognitive heuristics , " models of rationality in logic , the bridge between " novice " and " expert , " and the analysis of " belief perseverance " in pedagogy . The persons or " hackers " or " phreakers " as they are known in the industry , have learned how to break into and use the computers employed by the various companies to make long distance phone calls without having to pay for the service . The decision whether or not to stay on " d " drugs must be considered on a case-by-case basis . ' " " Drugs are strictly a demand-side problem . His actors he called " models " and like dummies in a shop window , he wanted them to express as little as possible . Whether a room has " good " or " bad " acoustics is an ill-defined question . This is similar to " settlement " models used today . Individuals with lactic acidosis may have to discontinue their " d " drugs and switch to other nucleoside analogs like AZT ( Retrovir ) , 3TC ( Epivir ) , or abacavir ( Ziagen ) . For the purposes of the policy , " drugs " is defined to include illegal drugs and narcotics . If external sensors asynchronously change the contents of memory locations , that allows the above " read " capabilities to be the basis for perceptual processes that control or modify actions.Likewise if some locations are linked through transducers to motors , then " write " instructionschanging those locations can cause signals to be transmitted to motors , which is how internalinformation manipulation often leads to external behaviour . The " d " drugs - - d4T , ddI , and ddC - - have a rare but serious side effect called lactic acidosis .