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Laterals are "L"-like consonants pronounced with an occlusion made somewhere along the axis of the tongue, while air from the lungs escapes at one side or both sides of the tongue.
One, found before vowels as in lady or fly, is called clear l, pronounced as the alveolarlateralapproximant [l] with a "neutral" position of the body of the tongue.
The symbol for the alveolarlateral flap is the basis for the expected symbol for the retroflex lateral flap: