“…It is of great interest to construct optimal sets of LHZ FHSs. There have been a number of optimal LHZ FHS sets satisfying Peng-Fan-Lee bound [22] (see for example [1,11,15,17,18,19,25,28]) and LHZ FHS sets with optimal partial Hamming correlation (PPHC) satisfying Niu-Peng-Liu-Liu bound [16] (see for example [9,10,13,14,24,26,28]). Now we give attention to the earlier constructions that are related to our work.…”