Expression 4: max left parenthesis, mod left parenthesis, "x" , 1 , right parenthesis , mod left parenthesis, "y" , 1 , right parenthesis , right parenthesis less than or equal to 1 left brace, "f" left parenthesis, floor left parenthesis, "x" , right parenthesis , floor left parenthesis, "y" , right parenthesis , right parenthesis less than StartFraction, left bracket, 0 , ...1 0 , right bracket Over 10 , EndFraction , right bracemaxmodx,1,mody,1≤1ffloorx,floory<0,...1010