void initializeBuild(int atomCountEstimate) {
		if (atomCountEstimate <= 0)
			atomCountEstimate = ATOM_GROWTH_INCREMENT;
		atoms = new Atom[atomCountEstimate];
		bonds = new Bond[250 + atomCountEstimate]; // was "2 *" -- WAY overkill.
		htAtomMap.clear();
		initializeGroupBuild();
	}