Given a list as an argument, construct a proper English string of one of the forms: 
sub and_a_list {
  if (@_ > 2) {
    join ", ", @_[0..$#_-1], " and $_[-1]"
  } elsif (@_ > 1) {
    "$_[0] and $_[1]"
  } elsif (@_ > 0) {
    $_[0]
  } else {
    ""
  }
}

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In reply to Format a list with commas and "and" by merlyn

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