sentences: a reinvent and beaches is a mean of hard implement & a panel is made of levers, source and axles, pulleys, and amino & a unscrew is a mean of hard implement & a protection is a mean of hard implement & a types is a mean of hard implement ->  a bicycle is made of more than one simple machines  a bicycle is made of more than one simple machines & a simple implement is made of more than zero hard implement -> a bicycle is a kind of complex machine