| (1) | - | coercion, as defined in section 15, or |
| (2) | - | undue influence, as defined in section 16, or |
| (3) | - | fraud, as defined in section 17, or |
| (4) | - | misrepresentation, as defined in section 18, or |
| (5) | - | mistake, subject to the provisions of sections 20, 21 and 22. |