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# snowflake fall blocks lesson
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design a blinking rectangle animation.
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## Topic
Forever
## Quick Links
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* [activity ](/lessons/snowflake-fall/activity )
* [quiz ](/lessons/snowflake-fall/quiz )
* [quiz answers ](/lessons/snowflake-fall/quiz-answers )
* [challenges ](/lessons/snowflake-fall/challenges )
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## Prior learning/place of lesson in scheme of work
Learn how to show LEDs with a, `pause` to pause program execution for a specified amount of milliseconds. We will be learning how to show images using forever loop as well as simple commands, such as pause and show LEDs.
## Documentation
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* **show LEDs** : [read more... ](/reference/basic/show-leds )
* **pause** : [read more... ](/reference/basic/pause )
* **forever** : [read more... ](/reference/basic/forever )
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```cards
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basic.showLeds(`
. . . . .
. . . . .
. . # . .
. . . . .
. . . . .
`)
basic.pause(100)
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basic.forever(() => {})
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```
