@Override
	public boolean equals(Object obj) {
		if (this == obj) {
			return true;
		}
		if (obj == null) {
			return false;
		}
		if (getClass() != obj.getClass()) {
			return false;
		}

		FcgLevel other = (FcgLevel) obj;
		if (direction != other.direction) {
			return false;
		}
		if (row != other.row) {
			return false;
		}
		return true;
	}
Returns the child level of this level.  The child of a level has the same direction 
as this level, with a distance of one more than this level.

@param the direction of the child
@return returns the child level of this level
@throws IllegalArgumentException if this is the source level, which is row 1
Ghidra/Features/GraphFunctionCalls/src/main/java/functioncalls/graph/FcgLevel.java