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In American football, the 3–3–5 defense is a defensive alignment consisting of three down linemen, three linebackers, and five defensive backs. The 3–3–5 defense can also be referred to as the 3–3 stack or the spread defense. It is one form of the nickel defense, a generic term for a formation with five defensive backs.
Claudius Ptolemy (/ ˈ t ɒ l ə m i /; Ancient Greek: Πτολεμαῖος, Ptolemaios; Latin: Claudius Ptolemaeus; c. 100 – 160s/170s AD) [1] was a Greco-Roman mathematician, astronomer, astrologer, geographer, and music theorist [2] who wrote about a dozen scientific treatises, three of which were important to later Byzantine, Islamic, and Western European science.