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spec: Wendy has also been instrumental in developing a placement within the Dermatology Department at Dewsbury for final year students who are embarking upon the Dermatology final year option module . In his preface , Waite explains that " [ N ] on-architects are often placed in positions of leadership or responsibility in a capital project process . What kinds of critters seem to live around this tree ? In particular , we show that any m by n matrix can be well approximated given q random rows and columns of the matrix , where q < < m , n. Approximation algorithms are often useful in obtaining efficient solutions to problems where no efficient exact computation is known , for example when the input data is extremely large , or when the problem is NP-hard .