| Giver | Post | Date |
| Lokibhai | Re: If, in the addition problem above, a, b, c, d, e, f, x, y, a | 14-Jul-2017 |
| dunghoang110 | Re: If, in the addition problem above, a, b, c, d, e, f, x, y, a | 28-Jan-2017 |
| ramsujan | Re: If, in the addition problem above, a, b, c, d, e, f, x, y, a | 26-Sep-2015 |