A child monitoring system for allowing an adult to be alerted when a child moved beyond a specific range from the adult. Elements of the input matrix are grouped across a second dimension of the input matrix to form groups of matrix elements. The striking means sealed by a seal is cup-like. The bucket attachment is well adapted for use with a skid steer loader or other tractor for trenching, excavation and moving of granular materials such as earth, sand, gravel or crushed rock.