f | 1 | [Path 1]: | f | 1 | [Path 1]:
| 2 | 0: Start of execution: Beginning Search |  | 2 | 0: Start of execution: Beginning Search
| 3 | 1: Searching: query |  | 3 | 1: Searching: query
| 4 | 2: Searching: sibling(chuck, peter) |  | 4 | 2: Searching: sibling(chuck, peter)
| 5 | 3: Searching: brother_or_sister(chuck, peter) |  | 5 | 3: Searching: brother_or_sister(chuck, peter)
n | 6 | 4: Fail: brother_or_sister(chuck, peter) | n | 6 | 4: Fail: brother_or_sister(chuck, peter) | {'Result': 'Search Failed'}
| 7 | 5: Fail: sibling(chuck, peter) |  | 7 | 5: Fail: sibling(chuck, peter) | {'Result': 'Search Failed'}
| 8 | 6: Fail: query |  | 8 | 6: Fail: query | {'Result': 'Search Failed'}
| 9 |  |  | 9 |
t | 10 | [Path 2]: | t |  |
| 11 | 7: Searching: sibling(michael, peter) |  |  |
| 12 | 8: Searching: brother_or_sister(michael, peter) |  |  |
| 13 | 9: Fail: brother_or_sister(michael, peter) |  |  |
| 14 | 10: Fail: sibling(michael, peter) |  |  |
| 15 |  |  |  |
| 16 | [Path 3]: |  |  |
| 17 | 11: Searching: sibling(michael, chuck) |  |  |
| 18 | 12: Searching: brother_or_sister(michael, chuck) |  |  |
| 19 | 13: Found: brother_or_sister(michael, chuck) |  |  |
| 20 | 14: Found: sibling(michael, chuck) |  |  |
| 21 | 15: Searching: grandparent(Candidate Variable_0, michael) |  |  |
| 22 | 16: Searching: parent(Candidate Variable_0, Candidate Variable_1) |  |  |
| 23 | 17: Found: parent(martha, Candidate Variable_1) |  |  |
| 24 | 18: Searching: parent(Candidate Variable_1, michael) |  |  |
| 25 | 19: Fail: parent(Candidate Variable_1, michael) |  |  |
| 26 |  |  |  |
| 27 | [Path 4]: |  |  |
| 28 | 20: Searching: sibling(peter, chuck) |  |  |
| 29 | 21: Searching: brother_or_sister(peter, chuck) |  |  |
| 30 | 22: Fail: brother_or_sister(peter, chuck) |  |  |
| 31 | 23: Fail: sibling(peter, chuck) |  |  |
| 32 | 24: Fail: query |  |  |
| 33 |  |  |  |
| 34 | [Path 5]: |  |  |
| 35 | 25: Searching: sibling(peter, michael) |  |  |
| 36 | 26: Searching: brother_or_sister(peter, michael) |  |  |
| 37 | 27: Found: brother_or_sister(peter, michael) |  |  |
| 38 | 28: Found: sibling(peter, michael) |  |  |
| 39 | 29: Searching: grandparent(Candidate Variable_2, peter) |  |  |
| 40 | 30: Searching: parent(Candidate Variable_2, Candidate Variable_3) |  |  |
| 41 | 31: Found: parent(martha, Candidate Variable_3) |  |  |
| 42 | 32: Searching: parent(Candidate Variable_3, peter) |  |  |
| 43 | 33: Found: parent(mark, peter) |  |  |
| 44 | 34: Found: grandparent(martha, peter) |  |  |
| 45 | 35: Found: query | {'Result': 'Search Failed'} |  |  |
| 46 |  |  |  |
| 47 |  |  |  |
| 48 | There seems to a logical error the code or the question. Please check if the provided information is sufficient to answer the question. |  |  |

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