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1. 
The abacus is a tool that we have used (long) for counting.
2. 
They are using abacuses (currently) in many parts of the world.
3. 
People think that the Chinese had invented them (originally).
4. 
They had constructed similar counting boards (already) in Roman times.
5. 
They had used them (reportedly, widely) across Europe.
6. 
Calculators have overtaken the abacus (largely).
7. 
It's interesting that they have not made it obsolete (completely).