one alumnus -- two alumni 
one syllabus -- two syllabi 
one alumna -- two alumnae 
one alga -- many algae 
one criterion -- many criteria 
one forum -- many fora (ou : forums) 
one thesis -- two theses 
one hypothesis -- two hypotheses 
one phenomenon -- two phenomena 
one cactus -- two cacti (ou : cactuses) 
one diagnosis -- two diagnoses 
one oasis -- two oases 
one analysis -- two analyses 
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