A method of obtaining a resolution-based proof of unsatisfiability using a SAT procedure for a hybrid Boolean constraint problem comprising representing constraints as a combination of clauses and interconnected gates. The detection module detects a network congestion status. Memory blocks have every other wordline coupled to one adjacent decoder circuit, and the remaining wordlines coupled to another adjacent decoder circuit. the mattress foundation members can be oriented with respect to each other so as to provide a combined height that is adjustable.