default boolean removeAll(Collection<?> col) {
			boolean result = false;
			for (Object e : col) {
				result |= remove(e);
			}
			return result;
		}
Get and remove the first element

@return the first element, or null if empty
Ghidra/Framework/Generic/src/main/java/ghidra/generic/util/datastruct/ValueSortedMap.java