map @routineMap {
  insert insertKey error message "the '%K' routine has been already declared"
  search searchKey error message "the '%K' routine is not declared"
}

abstract class @instruction {
}

class @penUp : @instruction {
}

class @penDown : @instruction {
}

class @forward : @instruction {
    @luint mLength
}

class @rotate : @instruction {
    @luint mAngle
}