I've seen it both ways. Generally, if it's a first name, one s. If it's a last name, two.
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No. The word "desert" (a dry region) has one S. The word with two S's is "dessert" (the final course of a meal, such as cake or pie).
Next in sequence is 13112221.This series describes each number that came before it:1 [One]11 [One One]21 [Two One(s)]1211 [One Two and One One(s)]111221 [One One, One Two, and Two One(s)]312211 [Three One(s), Two Two(s), and One One]The next number in the series is:13112221 [One Three, One One, Two Two(s), Two One(s)]
The next letter will be a "b." The pattern 2-1-3-2-4-3-etc. So the "a"s and "b"s will each increase by one. First there were two "b"s, then one "a." Then there were three "b"s and two "a"s. So next there will be four "b"s and three "a"s, five "b"s and four "a"s, and so on.
Two-fifths times one-fourth is two-twentieths or one-tenth, in simplified form.
1/3 of 2/5 is 2/15