define a simple machine
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define a simple machine
define simple machines
define the term simple machine
define machine learning in simple words
define wheel and axle simple machine
define pulley simple machine
define lever simple machine
define screw simple machine
define simple machines for kids
define a simple machine, define simple machines, define the term simple machine, define machine learning in simple words, define wheel and axle simple machine, define pulley simple machine, define lever simple machine, define screw simple machine, define simple machines for kids