Suppose $G$ is a group. Lets call $\phi \in Aut(G)$ word automorphism iff $\exists n \in \mathbb{N} \{a_i\}_{i=0}^n \subset G \{e_i\}_{i=0}^n \subset \{-1; 1\} \forall t \in G \phi(t) = a_0t^{e_1}a_1…t^{e_n}a_n$. One can easily see, that all the word automorphisms form a normal subgroup in $Au...