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uṁp
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#Explanation
uṁp Full program. p Prime factors of each. ṁ Map function over list and concatentate the result. u Unique.
uΣ†puṁp Full program. p Prime factors of each. ṁ FlattenMap function over list and concatentate the result. u Unique.
uΣ†p Full program. p Prime factors of each. ṁ Flatten. u Unique.
