@Override
	public String toString() {
		return toString(TimeRadix.DEFAULT);
	}
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