| 1 | There were lots of buffaloes in the North America 100 years ago. | |
| 2 | The benign weather brought North America a bumper crop. | |
| 3 | Several of them were from North America while one was from Europe. | |
| 4 | One is marching across Europe and north America at this very moment. | |
| 5 | Both the first and third eruptions covered most of North America with ash. |
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