Centuries: 15th century - 16th century - 17th century
Decades: 1500s 1510s 1520s 1530s 1540s - 1550s - 1560s 1570s 1580s 1590s 1600s
Years: 1554 1555 1556 1557 1558 - 1559 - 1560 1561 1562 1563 1564
... proper subsets.
Wikipedia uses the newer system, which can be handled by a wider variety of web browsers.
Analogous comments apply to supersets.
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