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							Convert a Number to Words
								Certification: Intermediate Level
								Accuracy: 33.33%
								Submissions: 15
								Points: 15
							
							Write a Python function to convert a given integer into its word representation.
Example 1
- Input: num = 123
 - Output: "one hundred twenty-three"
 - Explanation: 
- Step 1: Break down 123 into place values: 1 hundred and 23.
 - Step 2: Convert 1 hundred to words: "one hundred".
 - Step 3: Convert 23 to words: "twenty-three".
 - Step 4: Combine the parts: "one hundred twenty-three".
 - Step 5: Return the final word representation.
 
 
Example 2
- Input: num = 4567
 - Output: "four thousand five hundred sixty-seven"
 - Explanation: 
- Step 1: Break down 4567 into place values: 4 thousand and 567.
 - Step 2: Convert 4 thousand to words: "four thousand".
 - Step 3: Break down 567 into place values: 5 hundred and 67.
 - Step 4: Convert 5 hundred to words: "five hundred".
 - Step 5: Convert 67 to words: "sixty-seven".
 - Step 6: Combine the parts: "four thousand five hundred sixty-seven".
 - Step 7: Return the final word representation.
 
 
Constraints
- 0 <= number <= 10^6
 - Time Complexity: O(1)
 - Space Complexity: O(1)
 
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Solution Hints
- Break the number into parts (thousands, hundreds, tens, units).
 - Use dictionaries or lists to map numbers to their word equivalents.
 - Handle edge cases like zero and numbers less than 20 separately.