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With the exception of quoted character strings, which are reproduced exactly as they appear in a problem descriptor, words, characters and other text items used in problem descriptors are NOT case sensitive.  

 

Upper case letters and lower case letters are equivalent.  

 

The text items variables, VARIABLES, Variables and mixed case text like VaRiAbles are all equivalent.  

Judicious use of capitalization can improve the readability of the script.