How To Spell s21?
Correct pronunciation for the word "s21" is [ˈɛs twˈɛntiwˈɒn], [ˈɛs twˈɛntiwˈɒn], [ˈɛ_s t_w_ˈɛ_n_t_i_w_ˈɒ_n].
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Usage over time for s21:
This graph shows how "s21" have occurred between 1800 and 2008 in a corpus of English books.
