Identify the Lewis acids in the following reactions:

1. ${\mathbf{BF}}_{\mathbf{3}}\mathbf{+}{\mathbf{NH}}_{\mathbf{3}}\mathbf{\rightleftharpoons }{\mathbf{F}}_{\mathbf{3}}\overline{\mathbf{B}}\mathbf{-}\stackrel{\mathbf{+}}{\mathbf{N}}{\mathbf{H}}_{\mathbf{3}}$
2. ${\mathbf{F}}^{\mathbf{-}}\mathbf{+}{\mathbf{AsF}}_{\mathbf{5}}\mathbf{\rightleftharpoons }{\mathbf{AsF}}_{\mathbf{6}}^{\mathbf{-}}$
   

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