He substitutes lingua alveolar sounds for these three (s/f, z/v, l/w). I worked with him for 45 minutes and during the entire session, he chronically licked his lips (predominantly his lower lip). His tongue was deeply scalloped when he was asked to protrude it and he had an abnormal rest posture (since all he was doing was licking his lips! ) He was not able to pucker/move the upper lip at all and the lower lip barely moved. He had a very long philtrum.