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compound machines are generally
facts about compound machines
what are some compound machines
define a compound machine
definition of a compound machine
what is a compound machine definition
compound machine definition science
examples of compound machines
give an example of a compound machine
compound machine definition physical science
compound machine definition physics
compound machines are generally, facts about compound machines, what are some compound machines, define a compound machine, definition of a compound machine, what is a compound machine definition, compound machine definition science, examples of compound machines, give an example of a compound machine, compound machine definition physical science, compound machine definition physics
