+20 −0 =0 +11 −2 =2 +5 −1 =2 +6 −1 =1 +3 −1 =2 +8 −1 =2 +5 −0 =3 +13 −0 =0 +14 −4 =3 +8 −3 =7 +12 −3 =3 +20 −1 =7 +14 −1 =1 +9 −2 =4 +4 −0 =2 +13 −2 =3 +10 −1 =7 +3 −0 =3 +8 −0 =5 +13 −1 =6 +10 −2 =8 +9 −4 =2 +6 −0 =13 +3 −5 =10 +6 −3 =5 