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