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Default Compare multiple rows for duplicated values in individual columns

I've put together an algorithm to compare students' responses (i.e. compare
one students' responses against all other students). The workbook accomodates
8 individual multiple choice test worksheets +8 individual multiple choice
scoring worksheets +8 individual multiple choice grading worksheets [+ 8
Short Answer sheets in the same breakdown]. My problem is that even though I
can get the code to work, after I copy the algorithm into four or five sheets
the file gets so big that my Dell Vostro (2.2 GHz w/ 4 GB RAM) fails and
excel crashes. I'm basically writing an if statement: IF(cell=other cell,1,0)
but duplicated 100 times (for 100 multiple choice questions) and for 30
students against 30 students X 12 classes: 100X30X30X12 - it's big on one
worksheet; then I try to copy it onto 8 more. The objective here is to
determine whether students are copying off each other...
 
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