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    PR # 31216                                                                   
     Many rich luminous distant clusters are observed, but distant cluster       
     s with  low luminosity have not been observed yet. But as for ASCA, i       
     t is good  aproach for the study the cluster evolution to observe suc       
     h clusters, because ASCA can determine temperature and abundance of s       
     uch clusters.  We propose to observe distant clusters with low lumino       
     sity A1942 and A1933..                                                      
                                                                                 
                                                                                 
                                                                                 
                                                                                 
                                                                                 
                                                                                 
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