"turtle robots" . . "Turtle educational robots" . . "Logo Turtle" . . "turtle (robot)" . "Turtle (robot)" . . . "\\\"Turtle\\\" robots" . . "a robot of the same name" . "Turtle (robot)" . "turtle" . "Turtle robots" . "Turtle" . . "turtle robot" . "Turtle robot" . "turtle roamers" . . "Turtles" . . "turtles" . . .