; ("-p", Arg.Set_float p, " Probability of spontaneous growth.")
; ("-x", Arg.Set_int x, " Forest width.")
; ("-y", Arg.Set_int y, " Forest height.")
; ("-p", Arg.Set_float p, " Probability of spontaneous growth.")
; ("-x", Arg.Set_int x, " Forest width.")
; ("-y", Arg.Set_int y, " Forest height.")