protected function getPossibleKeys()
	{
		$keys = [];
		foreach (range('a', 'z') as $char)
		{
			$keys[] = $this->keyPrefix . $char;
		}

		return $keys;
	}
protected function getPossibleKeys()
	{
		$keys = [];
		foreach (range('a', 'z') as $char)
		{
			$keys[] = $this->keyPrefix . $char;
		}

		return $keys;
	}
protected function getPossibleKeys ( ) { $ keys = [ ] ; foreach ( range ( 'a' , 'z' ) as $ char ) { $ keys [ ] = $ this -> keyPrefix . $ char ; } return $ keys ; }
Return a list of possible dictionary keys

@return string[]
Return a list of possible dictionary keys