Not like that, since you must return a specially-formatted string, so like this

sub InThaiVowel {
    return join "\n", 
'0E30 0E45',
'0E4D',
'0E22',#Thai consonant yo-yak can also be a vowel (like 'y' in English
+)
'0E2D',#Thai consonant or-ang can also be a vowel
'0E27',#Thai consonant wo-wen is only a vowel following mai han-akat

}
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