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$ sed -n '/Sheet2/,/Sheet3/ {/Sheet/d; p}' file
a,6
a,7
a,8
a,9
a,10

Yes, we wouldn't want to disappoint. :D Here are two possible ways, both of which I like:

$ sed -n "/Sheet2/,/Sheet3/ p" file | grep -v Sheet
a,6
a,7
a,8
a,9
a,10


$ awk '/Sheet3/ { exit...