  A formula for factorizations of the full twist in the braid group $Br_{2m}$
depending on any four factorizations of the full twist in $Br_{m}$ is given.
Applying this formula, a symplectic 4-manifold $X$ and two isotopic generic
coverings $f_i :X\to \mathbb C\mathbb P^2$, branched, respectively, along
cuspidal Hurwitz curves $\bar H_i\subset \mathbb C\mathbb P^2$ (without
negative nodes) having different braid monodromy factorization types, are
constructed. The class of the fundamental groups of the complements of the
affine plane Hurwitz curves is described in terms of generators and defining
relations.
