Here is a set of basic questions producing integer or string outputs. Answer them and format the result precisely with the JSON instructions provided:

Question 0 (Question id: q_dvA6cCN8):
Your job is to return the last character of a string as a string. For example, the last char of "hello" is "o". Return the last character of the following string: "has"

Question 1 (Question id: q_RuqDT):
Calculate 3 / 1.

Question 2 (Question id: q_3bgrS):
Solve for f: -4*f - 15 = -31 Respond with an integer.

Question 3 (Question id: q_5ct7Tl):
How many times does the letter "h" appear in the text: "in length"? Respond with an integer.

Question 4 (Question id: q_74HDm):
How many times does the letter "r" appear in the text: "other medium a"? Respond with an integer.

Question 5 (Question id: q_bJYt1):
Your job is to return the last character of a string as a string. For example, the last char of "hello" is "o". Return the last character of the following string: "biology"

Question 6 (Question id: q_CquT5cQh):
Calculate 6 - 4 + 6.



Return a JSON with each question id as a key.

The value for each key should be an object that contains the answer in the field 'answer'.
For even integers, nest 'half_answer' and 'double_answer' inside an additional 'additional_answer_info' field in the answer object.
For last-character tasks, provide 'original_string' alongside the answer.

Now provide the result JSON using the described format.

{"ground_truth": {"q_dvA6cCN8": {"answer": "s", "original_string": "has"}, "q_RuqDT": {"answer": 3}, "q_3bgrS": {"answer": 4, "additional_answer_info": {"half_answer": 2, "double_answer": 8}}, "q_5ct7Tl": {"answer": 1}, "q_74HDm": {"answer": 1}, "q_bJYt1": {"answer": "y", "original_string": "biology"}, "q_CquT5cQh": {"answer": 8, "additional_answer_info": {"half_answer": 4, "double_answer": 16}}}}