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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