Definition: In this task, you are given a text of the article. Your task is to generate a headline (title) for this article.
Input: polls opened across greenland at #:## am -lrb- #### gmt -rrb- tuesday for a referendum on self-rule for the island that could pave the way for full independence from denmark in the future .

UNK UNK UNK UNK polls open in greenland self-rule referendum