NISS + skew centers
Advanced edge insertions (slice moves shenaningans)
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more for other insertions :

sexy F2 lexy F2

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by Daniel Rose-Levine:
Scramble: R' U' F D' F2 D U2 R2 D' L2 R' B2 F2 U2 B U L B' U F' L' U R' U' F

U L F2 U F' + R' F' // 222
R2 B2 U // 223
B R2 U R' U' R2 B' // 4C

+ F2 B2 L2 U L2 F2 B2 R2 D R2

Solution // U L F2 U F B2 L2 U L2 F2 B2 R2 D R F' R2 B2 U B R2 U R' U' R2 B' - 25

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ADD MANY EXAMPLES!
- 2.2 find a good skeleton
- 2.1.9, 2.1.10


add later: commutator tutorial
edge 3-cycle analysis
niss: why niss?
      add 2c2e example as exercise
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References: tutorial by Andrew Nathenson, FMC group facebook (reddit?)
            other tutorials on youtube?