a. | one year | 1. | 24 hours |
b. | one hour | 2. | 60 seconds |
c. | one minute | 3. | 60 minutes |
d. | one day | 4 | 12 months |
\[10-1=9\] |
\[100-1=99\] |
\[1000-1=\,\,[\,?\,]\] |
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