The research of this paper is supported by NSFC (No. 10071068), Yunnan Applied Fundamental ResearchFoundation (No. 96a001z) and UGC(HK) (No. 2160126).
W irst Introduce the concept oftrames.Definition We call txne(2,2)alsebr洲;+;·)a w。e If B Is elldowed with an uPP。rsc。lllattlce order‘”<”“satlsfyingthe Nil。