Here is the correct version:
To go on a trip to Long White Mountain, make sure you pay attention to a few things.
First, check the weather forecast. If it's clear in the lower part of the mountains but rainy or snowy in the upper part, you may need to pack your jacket and pants instead.
Secondly, remember to wear warm clothes because September is coming and you'll be outside for long periods.
Lastly, enjoy the special offer: senior citizens can get free admission. Veterans also receive a discount. Children under the age of fifteen are also free to visit.
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