If strongmode is true plugin will be check CONTEINS repeat in new message:
1:"123" 2:"1234" - will be blocked, but 1:"64 diamonds" 2:"64 diamonds blocks" also will be blocked
If strongmode is false. Message will be blocked if it EQUALS new message:
1:"123" 2:"1234" - will not be blocked, but 1:"HERE!" 2:"HERE!!" also will not be blocked