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SISTEMA DI 21 NUMERI DIVISI IN 70 TERZINE
CON L' USCITA DI 2 NUMERI SI REALIZZA UN AMBO
SVILUPPO :
| 1-2-3- |
4-5-6 |
7-8-9 |
10-11-12 |
13-14-15 |
| 16-17-18 |
19-20-21 |
1-4-7 |
1-5-8 |
1-6-9 |
| 1-10-13 |
1-11-14 |
1-12-15 |
1-16-19 |
1-17-20 |
| 1-18-21 |
2-4-9 |
2-5-7 |
2-6-8 |
2-10-15 |
| 2-11-13 |
2-12-14 |
2-16-21 |
2-17-19 |
2-18-20 |
| 3-4-8 |
3-5-9 |
3-6-7 |
3-10-14 |
3-11-15 |
| 3-12-13 |
3-16-20 |
3-17-21 |
3-18-19 |
4-10-16 |
| 4-11-17 |
4-12-18 |
4-13-19 |
4-14-20 |
4-15-21 |
| 5-10-17 |
5-11-18 |
5-12-19 |
5-13-20 |
5-14-21 |
| 5-15-16 |
6-10-18 |
6-11-19 |
6-12-20 |
6-13-21 |
| 6-15-17 |
6-14-16 |
7-10-19 |
7-11-16 |
7-12-21 |
| 7-13-18 |
7-14-17 |
7-15-20 |
8-10-20 |
8-11-21 |
| 8-12-16 |
8-13-17 |
8-14-18 |
8-15-19 |
9-10-21 |
| 9-11-20 |
9-12-17 |
9-13-16 |
9-14-19 |
9-15-18 |
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