What's your favorite commutator?

My favorite is [D, R U R']. I like it because it's the first commutator I really understood, also I think it's quite cool and useful.Another one I like is [L2, U R2 U'], though.
 
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U2 M' U2 M

R U R' U' R U R' U' R U R' U' D2 R U R' U' R U R' U' R U R' U' D2

and offcourse:
R2 D R' U2 R D' R' U2 R' Headlights OLL
r U R' U' r' F R F Chameleon OLL
F' r U R' U' r' F R Bowtie OLL
 
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Thats conjugate nub :P

c:[a,b]=[c:a,c:b] nub :P

R U R' U' R U R' U' R U R' U' D2 R U R' U' R U R' U' R U R' U' D2

I think you mean R U R' U' R U R' U' R U R' U' D2 U R U' R' U R U' R' U R U' R' D2 but it cancels to R U R' U' R U R' U' R U R' D2 R U' R' U R U' R' U R U' R' D2
 
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