text: if the character of s2 is not present in S1 , then check if previous two ASCII characters are present in S1
code: else if ( mp [ S2 [ i ] - 1 ] && mp [ S2 [ i ] - 2 ] ) { mp [ S2 [ i ] - 1 ] -- ; mp [ S2 [ i ] - 2 ] -- ; } else { return false ; } } return true ; }