Another example is the root of the verb "to heal", which has the form 낫 "nas-" before a consonant, as in 낫다 "natta," but the form 나 before a vowel, as in 나아 "naa." In some cases, there is an epenthetic "ŭ" vowel before a consonant suffix, as in 나을 "naŭl." In "New Orthography," this variable root is written as an invariable , and the epenthetic vowel is not written: NA’.DA for 낫다 "natta," NA’.L for 나을 "naŭl," NA’.A for 나아 "naa."