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https://euzicasa.wordpress.com/2014/12/25/the-christmas-truce-of-world-war-i-1914-people-who-sings-same-carols-in-different-languages-on-christmas-at-least-cannot-by-enemies-even-in-the-most-helish-circumstances-not-of-their-own-m/
The "Christmas Truce" of World War I (1914): people who sings same carols in different languages, on Christmas, at least, cannot by enemies, even in the most helish circumstances (not of their own making)