my (@opt_i_list, @opt_o_list, @opt_p_list);

#
#    ####Put options into Arrays
#

if ($opt_i) {
   @opt_i_list = split(",", $opt_i);
} else { #No $opt_i parameter: Use default
   $opt_i_list[0] = $DEFAULT_OPT_I_VALUE;
}

if ($opt_o) {
   @opt_o_list = split(",", $opt_o);
} else {
   $opt_o_list[0] = $DEFAULT_OPT_O_VALUE;
}

if ($opt_p) {
   @opt_p_list = split(",", $opt_p);
} else {
   $opt_p_list[0] = $DEFAULT_OPT_P_VALUE;
}

#
#   ####Now run processOne for each arrangement of parameters
#

foreach my $opt_i_value (@opt_i_list) {
   foreach my $opt_o_value (@opt_o_list) {
      foreach my $opt_p_value (@opt_p_list {
         processOne('$opt_i_value',$opt_p_value,$opt_o_value)
      }
   }
}