Statements:
All districts are towns.
No town is a city.
All cities are centres.
Conclusion:
I. Some towns are districts.
II. Some cities are not districts.
III. Some towns are not cities.
All districts are towns. (A) Conversion Some towns are districts(I). Hence conclusion I follow. All districts are towns. (A) + No town is a city. (E) No district is a city. (E) Conversion Some cities are not districts. (O). Hence conclusion II follows. No town is a city. (E) Conversion No city is a town. (E) Conversion Some town are not cities. (O). Hence conclusion III follows.
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