Final answer:
The subject of this question is Computers and Technology. It is a High School level question asking for a program that reads in a file containing a list of words separated by commas and outputs the words and their frequencies, without any duplicates.
Step-by-step explanation:
The subject of this question is Computers and Technology and the grade level is High School. The question is asking for a program that reads in a file containing a list of words separated by commas and outputs the words and their frequencies, without any duplicates. This program involves techniques related to file input and processing, as well as implementing word frequency.