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-# @extends
-
-### #letexample
-
-A variable is created for the number returned by the [brightness](/reference/led/brightness) function.
-
-```block
-let b = led.brightness();
-```
-
-### #readvariableexample
-
-For example, the following code shows the value stored in `counter` on the LED screen:
-
-```blocks
-let counter = 1;
-basic.showNumber(counter);
-```
-
-### #updatevariableexample
-
-The following code sets `counter` to 1 and then increments `counter` by 10:
-
-```block
-let counter = 1;
-counter = counter + 10;
-basic.showNumber(counter);
-```
-
-### #whyusevariablesexample
-
-A counter is a great example:
-
-```block
-let counter = 0;
-input.onButtonPressed(Button.A, () => { 
-  counter = counter + 1;
-  basic.showNumber(counter);
-});
-```
-
-### #localvariableexample
-```block
-// x does NOT exist here.
-if (led.brightness() > 128) {
-  // x exists here
-  let x = 0;
-}
-```