How do I fill these gaps in the sliding patio doors??

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All my sliding doors have these gaps at the bottom that let air and pests in. How do I fill these correctly and permanently? They're about 1 to 1.5 inches long on both sides of the door. Ive put a temporary adhesive weather strip in place for now but need a perm solution please!

how do i fill these gaps in the sliding patio doors
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