A placement quality parameter for each of the block configurations is derived based on {HEAD ~ a set} of {TAIL ~ block placement rules} and on the layout quality parameters, and a final block configuration is selected by comparing the placement quality parameters corresponding to particular block configurations 
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A placement quality parameter for each of the block configurations is derived based on { HEAD ~ a set } of { TAIL ~ block placement rules } and on the layout quality parameters , and a final block configuration is selected by comparing the placement quality parameters corresponding to particular block configurations
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