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what are the six simple machines
what are the six simple machines in science
six simple machines
six types of simple machines
what are the six types of simple machines
six simple machines examples
all six simple machines
name the six types of simple machines
what are the six simple machines, what are the six simple machines in science, six simple machines, six types of simple machines, what are the six types of simple machines, six simple machines examples, all six simple machines, name the six types of simple machines
