func step4(word *snowballword.SnowballWord) bool {

	// (1) Undouble "н", or, 2) if the word ends with a SUPERLATIVE ending,
	// (remove it and undouble н n), or 3) if the word ends ь (') (soft sign)
	// remove it.

	// Undouble "н"
	if word.HasSuffixRunes([]rune("нн")) {
		word.RemoveLastNRunes(1)
		return true
	}

	// Remove superlative endings
	suffix, _ := word.RemoveFirstSuffix("ейше", "ейш")
	if suffix != "" {
		// Undouble "н"
		if word.HasSuffixRunes([]rune("нн")) {
			word.RemoveLastNRunes(1)
		}
		return true
	}

	// Remove soft sign
	if rsLen := len(word.RS); rsLen > 0 && word.RS[rsLen-1] == 'ь' {
		word.RemoveLastNRunes(1)
		return true
	}
	return false
}
func step4(word *snowballword.SnowballWord) bool {

	
	
	

	
	if word.HasSuffixRunes([]rune("нн")) {
		word.RemoveLastNRunes(1)
		return true
	}

	
	suffix, _ := word.RemoveFirstSuffix("ейше", "ейш")
	if suffix != "" {
		
		if word.HasSuffixRunes([]rune("нн")) {
			word.RemoveLastNRunes(1)
		}
		return true
	}

	
	if rsLen := len(word.RS); rsLen > 0 && word.RS[rsLen-1] == 'ь' {
		word.RemoveLastNRunes(1)
		return true
	}
	return false
}
func step4 ( word * snowballword . SnowballWord ) bool { // (1) Undouble "н", or, 2) if the word ends with a SUPERLATIVE ending, // (remove it and undouble н n), or 3) if the word ends ь (') (soft sign) // remove it. // Undouble "н" if word . HasSuffixRunes ( [ ] rune ( " ) { word . RemoveLastNRunes ( 1 ) return true } // Remove superlative endings suffix , _ := word . RemoveFirstSuffix ( " е й " if suffix != " " { // Undouble "н" if word . HasSuffixRunes ( [ ] rune ( " ) { word . RemoveLastNRunes ( 1 ) } return true } // Remove soft sign if rsLen := len ( word . RS ) ; rsLen > 0 && word . RS [ rsLen - 1 ] == 'ь'  word . RemoveLastNRunes ( 1 ) return true } return false }
// Step 4 is the undoubling of double non-vowel endings
// and removal of superlative endings.
//
Step 4 is the undoubling of double non - vowel endings and removal of superlative endings .