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The output of your command "$ ncal" is:

    December 2025     
Su     7 14 21 28   
Mo  1  8 15 22 29   
Tu  2  9 16 23 30   
We  3 10 17 24 31   
Th  4 11 18 25      
Fr  5 12 19 26      
Sa  6 13 20 27