Nothing
# BP years <yr[1]>:
[1] 1
# Era: Before Present (BP): Gregorian years (365.2425 days), counted backwards from 1950
# A tibble: 10 x 1
x
<yr>
1 1 BP
2 2 BP
3 3 BP
4 4 BP
5 5 BP
6 6 BP
7 7 BP
8 8 BP
9 9 BP
10 10 BP
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