1-1 2-2 3-3 4-4 5-5 6-6 7-7 8-8 9-9 10-10 11-11 12-12 13-13 14-14 15-15 16-16 17-17 18-18 19-19 20-20 21-21 22-22 23-23 24-24 25-25 26-26 27-27 28-28 29-29 30-30 31-31 32-32 33-33 34-34 35-35 36-36 37-37 38-38 39-39 40-40 41-41 42-42 44-44 45-45 46-46 47-47 48-48 49-49 50-50 52-52 53-53 54-54 55-55 56-56 57-57 58-58 59-59 60-60 61-61 62-62 63-63 64-64 65-65 66-66 67-67 68-68 69-69 70-70 71-71 72-72 73-73 74-74 75-75 76-76 77-77 78-78 79-79 80-80