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diff --git a/resources/src/mediawiki.language/languages/os.js b/resources/src/mediawiki.language/languages/os.js
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+++ b/resources/src/mediawiki.language/languages/os.js
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+/*!
+ * Ossetian (Ирон) language functions
+ * @author Santhosh Thottingal
+ */
+
+mediaWiki.language.convertGrammar = function ( word, form ) {
+	var grammarForms = mediaWiki.language.getData( 'os', 'grammarForms' ),
+		// Ending for allative case
+		endAllative = 'мæ',
+		// Variable for 'j' beetwen vowels
+		jot = '',
+		// Variable for "-" for not Ossetic words
+		hyphen = '',
+		// Variable for ending
+		ending = '';
+
+	if ( grammarForms && grammarForms[form] ) {
+		return grammarForms[form][word];
+	}
+	// Checking if the $word is in plural form
+	if ( word.match( /тæ$/i ) ) {
+		word = word.slice( 0, -1 );
+		endAllative = 'æм';
+	}
+	// Works if word is in singular form.
+	// Checking if word ends on one of the vowels: е, ё, и, о, ы, э, ю, я.
+	else if ( word.match( /[аæеёиоыэюя]$/i ) ) {
+		jot = 'й';
+	}
+	// Checking if word ends on 'у'. 'У' can be either consonant 'W' or vowel 'U' in cyrillic Ossetic.
+	// Examples: {{grammar:genitive|аунеу}} = аунеуы, {{grammar:genitive|лæппу}} = лæппуйы.
+	else if ( word.match( /у$/i ) ) {
+		if ( !word.slice( -2, -1 ).match( /[аæеёиоыэюя]$/i ) ) {
+			jot = 'й';
+		}
+	} else if ( !word.match( /[бвгджзйклмнопрстфхцчшщьъ]$/i ) ) {
+		hyphen = '-';
+	}
+
+	switch ( form ) {
+		case 'genitive':
+			ending = hyphen + jot + 'ы';
+			break;
+		case 'dative':
+			ending = hyphen + jot + 'æн';
+			break;
+		case 'allative':
+			ending = hyphen + endAllative;
+			break;
+		case 'ablative':
+			if ( jot === 'й' ) {
+				ending = hyphen + jot + 'æ';
+			}
+			else {
+				ending = hyphen + jot + 'æй';
+			}
+			break;
+		case 'superessive':
+			ending = hyphen + jot + 'ыл';
+			break;
+		case 'equative':
+			ending = hyphen + jot + 'ау';
+			break;
+		case 'comitative':
+			ending = hyphen + 'имæ';
+			break;
+	}
+	return word + ending;
+};