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1.
S₁: The 'age of computers' is considered to have begun in 1946.
S₆: And now it is difficult to find a field where computers are not used.

P: Those early computers were huge and heavy affairs, with problems of speed and size.
Q: It was only with the introduction of electronics that the computers really came of age.
R: But computers were in use long before that.
S: They had several rotating shafts and gears which almost always doomed them to slow operation.