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  1. or download this
    join ',', map "?", keys %$c
  2. or download this
    join ',', ("?") x keys %$c
  3. or download this
    chop(my $placeholderstr = join '', map {'?,'} keys %$c);
  4. or download this
    chop(my $placeholderstr = '?,' x keys %$c);