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The hyphen is a punctuation mark used to connect word elements that are written disjointedly or to divide a word at the end of a line of text. The first known documentation of the hyphen is in The Art of Grammar by Dionysius Thrax, a Classical Greek grammarian. This sublinear hyphen was a low tie mark that joined two words that would otherwise be read separately, because it was only in the 700s CE that spacing between words came into being. Then the scribes used the mark to connect two words that had been incorrectly separated by a space. The modern format of the hyphen originated with Johannes Gutenberg of Mainz, Germany, around 1455 with the publication of his 42-line Bible, courtesy of his new invention, the printing press.
The various forerunners of today's dashes tend to separate words and phrases. The mathematical sign of ( - ) represents subtraction, resulting in a difference, but its use (as with the addition sign) has been extended to many other meanings.
N49 AB.CDE W097 FG.HIJ
a. Square root of nine.
b. As the hobbits would say, eleventy-twelve minus eleventy-twelve.
c. According to Three Dog Night, what is the loneliest number?
d. In the description, how many times is the word (not the symbol) "hyphen" used?
e. Multiplicative identity for any real number.
f. IV minus GCAB27R.
g. The smallest perfect number.
h. The first safe prime number.
i. The atomic number of oxygen.
j. Yellow minus red.