def remove_unwanted_texts(txt):
	"""
		Removed messeges are of the type:
			'<media omitted>': Used by whatsapp to tell where a file was uploaded
			"(file attached)": Also Used by whatsapp to tell where a file was uploaded
			"this message was deleted": Used by whatsapp to tell where other users deleted a message
			"you message was deleted":  Used by whatsapp to tell where user deleted a message
		"""
	if (txt != '<media omitted>') & (txt.find("(file attached)")==-1) & (txt !="this message was deleted") & (txt!="you deleted this message"):
		return 1
	else:
		return 0