code: def checkmultiline(sometext, interchange = ALL):
  	
  	# check invalid data types
  	OnlyStringsCanBeChecked(sometext)
  	
  	if istext(sometext):
  		lines = re.split(r'\r\n|\n|\r', sometext)
  		if len(lines) > 1:
  			for line in lines:
  				if line.strip() == "":
  					continue # skip empty lines
  				if not checkstring(line, interchange = interchange):
  					return False
  			return True
  	# in other cases
  	return False
docs: Checks that some text is multiline palindrome. Checking performs case-insensitive
  		
  		:param str sometext:
  		    It is some string that will be checked for palindrome as multiline palindrome.
  			
  		    The multiline palindrome is text that contains palindrome at each line 
  		    (what is the text see at help(palindromus.istext)).
  			
  		    Only multiline text can be the multiline palindrome.
  			
  		:keyword dict interchange:
  		    It is dictionary of interchangeable letters
  			
  		:except TypeError:
  		    If the checked text is not a string
  			
  		:return bool: