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4. Adeyanju, I.A., Bello, O.O., Adegboye, M.A.: Machine learning methods for sign language recognition: A critical review and analysis. Intell. Syst. Appl. 12, 200056 (2021)
5. Andrada, J., Domingo, R.: Key findings for language planning from the national sign language committee (status report on the use of sign language in the philippines). In: 9th Philippine Linguistics Congress: Proceedings (2006)