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Raman scattering spectroscopy is applied to investigate the phonon modes in GaxIn1-xP (x=0.52) and (AlxGa1-x)0.51In0.49P (x=0.29) alloys. Two-mode behavior in GaxIn1-xP and three-mode behavior in (AlxGa1-x)0.51In0.49P are observed. In ordered GaxIn1-xP, w