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This PR solves #1374 There are 3 examples included in the PR: 1. `lookup_via_challenges_ext_simple.asm` is the most basic example which implements {a} in {b} using extension field without using selectors 2. `lookup_via_challenges_ext_no_selector.asm` implements {a1, a2} in {b1, b2} using extension field without using selectors 3. `lookup_via_challenges_ext.asm` is a more complex example than others which implements {a1, a2, a3} in {b1, b2, b3} using extension field (which also handles tuples using Reed-Solomon fingerprinting). It also use different lhs and rhs selectors. --------- Co-authored-by: Georg Wiese <georgwiese@gmail.com>