Centuries: 15th century - 16th century - 17th century
Decades: 1490s 1500s 1510s 1520s 1530s - 1540s - 1550s 1560s 1570s 1580s 1590s
Years: 1542 1543 1544 1545 1546 - 1547 - 1548 1549 1550 1551 1552
... f : E -> R), and given further two elements n, n' of N, find a path P from n to n', so that
p ∈ P
/ f(p) ...
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