Write an function that converts time into the corresponding english words - eg. '8:30' -> half past eight
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2:00 > two o'clock
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2:03 > three past two
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2:11 > eleven past two
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2:15 > quarter past two
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2:16 > sixteen past two
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2:20 > twenty past two
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2:30 > half past two
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2:33 > twenty seven to three
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2:40 > twenty to three
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2:55 > five to three