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 - How do these components work in circuits?
 
-- What are their symbols? What do they look like?
+- What are their [symbols?](./images/symbol_chart.png) What do they look like?
 
 - How to find and use [Datasheets](https://datasheet.octopart.com/ATTINY45-20SU-Atmel-datasheet-41301906.pdf).