A study of $$C\!P$$ violation in the decays $${{B} ^\pm } \rightarrow [{{K} ^+} {{K} ^-} {{\uppi } ^+} {{\uppi } ^-} ]_{D} h^{\pm }$$ ($$h = K, \pi $$) and $${{B} ^\pm } \rightarrow [{{\uppi } ^+} {{\uppi } ^-} {{\uppi } ^+} {{\uppi } ^-} ]_{D} h^{\pm }$$
European physical journal. C, Particles and fields