 Because Batangan is more closely related to ancient Tagalog, the merger of the phonemes "e" and "i" and the phonemes "o" and "u" are prevalent; "e" and "o" are allophones of "i" and "u", respectively, in Tagalog.Prevalent in Batangan but missing from other dialects are the sounds "ei" and "ow".Unlike their English counterparts, these diphthongs are sounded primarily on the first vowel and only rapidly on the second; this is similar to the "e" in the Spanish word "educación" and the first "o" in the Italian word "Antonio".