8 9 5+1=6 3+2=5 1+5=6 4+2=6 2+3=5 2+4=6 3+3=6 =2 =3 =4 =4 =3 =4 =6 =5 =6 =5 =6 =6 < < 1 2 3 4 7+2=9 3+5=8 2+7=9 5+3=8