And so will this formula variation based on Aflatoon's layout and data. Needs to be ARRAY Entered (CTRL + SHIFT + ENTER):
=SUM((FREQUENCY(MATCH($A$2:$A$23&$B$2:$B$23,$A$2:$A$23&$B$2:$B$23,0),MATCH( $A$2:$A$23&$B$2:$B$23,$A$2:$A$23&$B$2:$B$23,0))>0)*ISNUMBER(SEARCH(A2,$A$2: $A$24,1)))