S₁: The earth was initially very hot and without an atmosphere.
S₆: This early atmosphere was not one in which we could have survived.
P: The atmosphere came from the emission of gases from the rocks.
Q: Because it contained no oxygen.
R: In the course of time it cooled and acquired an atmosphere.
S: But it contained a lot of other gases that are poisonous to us.
The proper sequence should be
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