public static Sequence catenate(Sequence a, Sequence b) {
		Sequence result = new Sequence();
		result.advance(a);
		result.advance(b);
		return result;
	}
Construct (and normalize) a sequence formed by the steps in a followed by the steps in b

@param a the first sequence
@param b the second (appended) sequence
@return the resulting sequence
Ghidra/Debug/Framework-TraceModeling/src/main/java/ghidra/trace/model/time/schedule/Sequence.java