private void initOffsets() {
		offsets = new ArrayList<>();
		indexByOffset = new HashMap<>();
		int index = 0;
		for (Map.Entry<Long, AbstractMsSymbol> entry : symbolsByOffset.entrySet()) {
			offsets.add(index, entry.getKey());
			indexByOffset.put(entry.getKey(), index++);
		}
	}
Initialized the offsets list used for requesting the symbols in sequence.
Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/pdbapplicator/SymbolGroup.java