EXTEND: We only need to tell the user if it's a leap year or not. If it isn't a leap year, let's also tell them why!

• Comment out unneeded print()s and improve outputs, like this: print(year, "is not a leap year.")
• Inside either else-block, add three if statements under print(year,·"is·not·a·leap·year.")
• Use one if to check that condition_1a is False, one to check that condition_1b is False, and one for condition2. Include a print() in each if-block to let the user know which condition or conditions are False!

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