S₁: Of men's earliest inventions we know very little.
S₆: It was only a step further that he made a rude weapon by fastening a stone to the end of a stick.
P: Man used stick and stone long before he dared to meddle with fire.
Q: The first was to use a stone to crack a nut.
R: The next was the use of a stick to strike an enemy.
S: Once man had fire, he was the master of all lower creatures.
The proper sequence should be
P Q R S
Q R S P
S P Q R
S R Q P
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