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So far, I had understood a,c,d but for question b I didn’t understand, so when I count there are no double bonds in 4? I think the double bond ended at 7 so that where it came from and then the same for 10, but how about 4?

/in /by

So far, I had understood a,c,d but for question b I didn’t understand, so when I count there are no double bonds

in 4? I think the double bond ended at 7 so that where it came from and then the same for 10, but how about 4?

 
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