Checked markdown, added diagnostics

README.md

 
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 ##Sesión de laboratorio:
 
 ####Instrucciones
 
 1. Crea una función  `zigzag` que produzca la teselación de la Figura 9. 
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     ![figure9.png](images/figure9.png)
 
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 ##Laboratory Session
 
 In today's laboratory experience you will practice the use of nested loops to create different tessellations.