Availability is both plural and singular plural plural both plural and singular singular both plural and singular singular singular plural.
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How to say availabilities:
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1. What makes words plural?
2. What makes a word singular?
3. How to make acronyms plural.
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twelveth
caravans
hispanics
saddik
blenching
megalokaryocyte
unnominalistic
toxicophidia
unpoeticized
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