Quick test
Prompt
Complete the following Python function: ```python def count_distinct_characters(string: str) -> int: """ Given a string, find out how many distinct characters (regardless of case) does it consist of >>> count_distinct_characters('xyzXYZ') 3 >>> count_distinct_characters('Jerry') 4 """ ```
Answer guidance
Canonical solution (function body): return len(set(string.lower()))
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