Finished 12.3 and 12.4. deletion takes some time to absorb but it's not a complete mystery. The Proof in 12.4 requires some Math I hadn't work out yet.
Solved 12.4-4, P12.4(a), P4.4(a-c) in my head.
I also flipped the whole book once. It turns out the first 20 chapters of the book are mainly on organizing data (i.e. sorting and searching). It shows that how difficult a topic it is.
Ah, I want to get another exercise on paper today.
Fuzzy reading: 339/1144
Browse reading: 309/1144
Exercises up to P2.2
Exercises which are finished but not on paper: P.2.2{b-d}, P2.3{a-d}, P2.4{a-d}, P4.4(a-c), 6.1-{1,2,3,7}, 6.2-3, 6.2-4, 10.1-6, 10.1-7, 12.1-{1,2,4} 12.2-{2.3}, 12.4-4, P12.4(a),
Revisit: (af Ch3) P2.1c
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