public boolean hasDuplicateBlocks() {
		boolean res = false;
		for(InstructHash curInstruct : instList) {
			if (curInstruct.block.isVisited) {		// If visited before
				res = true;							// Indicates multiple InstructHashes from one block
				break;
			}
			curInstruct.block.isVisited = true;		// Mark block as visited
		}
		for(InstructHash curInstruct : instList) {
			curInstruct.block.isVisited = false;	// Clear visited flag
		}
		return res;
	}
@return true if any two InstructHash for this HashEntry share the same parent Block
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/correlate/HashEntry.java