S1 : Science has turned the world into one unit.
S6 : Practically every part of the world has friendly or hostile relationship with every other part.
P : Nowadays such pleasing illusions are impossible to have.
Q : Since that time they have been coming closer to each other.
R : Before the 16th century, America and the Far East were almost unrelated to Europe.
S : Augustus in Rome and Han Emperor in China simultaneously imagined themselves masters of the world.

The proper sequence should be:

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