Table 1. Speech materials

Word	IPA	POA (initial)	Final sounds
(a) pearl	[pɜ:ɹl]	lab	rl
bird	[bɜ:ɹd]	lab	rd
(b)world	[wɜ:ɹld]	lab-dor	rld
word	[wɜ:ɹd]	lab-dor	rd

IPA, International Phonetic Alphabet; POA, place of articulation.