Additional Interests
Add ID #9, and this one will be the second one for Music, so it needs to be
the same in value as ID 3. The result:

Fig. 1.47
Add ID #10. This will be the second one for Politics and will look just like
ID 4. The result:

Fig. 1.48
Add ID #11. This will be the third one for Music and should look just like
ID 5. The result:
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Fig. 1.49
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