1. In countries array check if 'Ethiopia' exists in the array if it exists print 'ETHIOPIA'. If it does not exist add to the countries list.
1. In the webTechs array check if 'Sass' exists in the array and if it exists print 'Sass is a CSS preprocess'. If it does not exist add 'Sass' to the array and print the array.
2. Concatenate the following two variables and store it in a fullStack variable.
2. Concatenate the following two arrays and store it in a fullStack variable.