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 - What are their symbols? What do they look like?
 
-- How to find and use Datasheets.
+- How to find and use [Datasheets](https://datasheet.octopart.com/ATTINY45-20SU-Atmel-datasheet-41301906.pdf).
 
+- For example, look up part in [Digikey](https://www.digikey.com/) or find in [Octopart](https://octopart.com/).
 ___
 
 ###Outline.