In version of Ngoo Siu-le [zh], /ɘe/ [ere] is spelled as [oe] while the Phonetic Symbol "ㄜ" is replaced with "".
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Iûⁿ, Ún-giân (2009). Processing Techniques for Written Taiwanese – Tone Sandhi and POS Tagging (PhD). National Taiwan University. p. 20. OCLC367595113.