| 1 | He has left his footprints all over the land. | |
| 2 | We look at it from packaging footprint. | |
| 3 | He wondered who left the tracks in the snow. | |
| 4 | But until now most of the work was on classifying the tracks. | |
| 5 | Usually a carbon footprint is calculated for the time period of a year. |
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