formation(GK, SW, DF, MF, ST, hardness = c(0, 0, 0, 0, 0), homeAdv = c(0, 0, 0, 0, 0))integer for the strength goalkeepervector for the strength of the sweeper, can be
NA or a numericnumeric vector for the strengths of the players in the
defensenumeric vector for the strengths of the players in the
midfieldnumeric vector of integers for the strenghts of the strikersnumeric vector of length five with integers for the used hardnessnumeric vector of length five with integers for the used hardnessS4 object of the class formation.