serenity screenplay bdd

1. http://serenity-bdd.info/docs/articles/screenplay-tutorial.html
2. http://www.baeldung.com/serenity-screenplay
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fixer api

1. https://fixer.io/
2. 
   

ussd

1. USSD (Unstructured Supplementary Service Data) is a Global System for Mobile(GSM) communication technology that is used to send text between a mobile phone and an application program in the network. Applications may include prepaid roaming or mobile chatting.
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raster vs vector

1. https://www.psprint.com/resources/difference-between-raster-vector/
2. 
   

lambda expression

1. https://howtodoinjava.com/java-8-tutorial/
2. https://www.journaldev.com/2389/java-8-features-with-examples
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gradle

1. gradle in 5 mins
2.