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" While the answer to the former is largely descriptive , the answer to the latter is entirely analytical . Since the names of arguments and return values are usually descriptive , the information that describe prints is usually all one needs to write a call . The terms of relationship used in different parts of the world may be divided , according to the author just quoted , into two great classes , the classificatory and descriptive , the latter being employed by us . More than merely descriptive , the technique allows experimentation with the animated system in silico to reveal the emergence of unpredicted properties in T-cell development .