Nitori naa ede eniyan yato si ena apeere, ifiyesi (Siganl Code) awon eranko.Awon Iwe amulo Fatusin, S.A (2001), An Introduction to the Phonetics and Phonology of English.. 
Awon ti n gbe ilu yii maa n ṣoju ati imu sára igi ilu yii.Yorùbá.. 