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In this note, we present a chain lemma for biquaternion algebras over fieldsof characteristic 2 in the style of the equivalent chain lemma by Sivatski incharacteristic not 2, and conclude a bound on the symbol length of classes in${_{2^n}Br}(F)$ whose symbol length in ${_{2^{n+1}}Br}(F)$ is at most 4.

Biquaternion Algebras, Chain Lemma and Symbol Length