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local tArgs = { ... }
local nDir = tArgs[1]
 
if not nDir then
        print("Usage: turn <direction>")
    print("Valid directions: L, R")
    return
end
 
if nDir == "l" then
    turtle.turnLeft()
    return
end
 
if nDir == "r" then
    turtle.turnRight()
    return
end
 
print("You must enter a valid direction.")
print("Valid directions: L, R")