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'echo January 1997 | tr [0-9]. ...........'
January ....
'echo S M Tu W Th F S | tr [0-9]. ...........'
S M Tu W Th F S
'echo 1 2 3 4 | tr [0-9]. ...........'
. . . .
'echo 5 6 7 8 9 10 11 | tr [0-9]. ...........'
. . . . . .. ..
'echo 12 13 14 15 16 17 18 | tr [0-9]. ...........'
.. .. .. .. .. .. ..
'echo 19 20 21 22 23 24 25 | tr [0-9]. ...........'
.. .. .. .. .. .. ..
'echo 26 27 28 29 30 31 | tr [0-9]. ...........'
.. .. .. .. .. ..
'echo | tr [0-9]. ...........'
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