s3=[]
 for g in groups.values(): s3+=g
 s3.sort(key=lambda z:z[7])
 DD[0]+=dl
 print('CALL',u,'typ',typ,'pair',a,b,'D',dl,'surv',len(s3),'k',k)
 if not s3: return None
 return min(s3,key=lambda z:(z[6],z[7]))