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Defects are most easily divided into five groups that encompass both manmade and naturally occurring imperfections: conversion, which refers to defects that are created during processing of the lumber, such as improper sawing or chips caused by a falling tool; fungus resulting from high humidity and warm air; insects such as carpenter ants or termites; natural forces like abnormal tree growth; and improper seasoning from the uneven drying of lumber.
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