At least five words ending in US form their plurals by changing the US to I. At least one word ending in IE has an optional plural ending in I. What are the words?
Answer:
1. RADIUS - RADII
2. UTERUS - UTERI
3. ALUMNUS - ALUMNI
4. CACTUS - CACTI
5. FUNGUS - FUNGI
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6. GENIE - GENII (of GENIES)
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