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  {command1} {file [file2 ...]} {dest_path}
  {command2} {file_name} {dest [dest2 ...]}
  {command3} {url} {file} {word [word2 ...]} {email@address}

# assume that $_ is input line with command word removed,
# and that @tab_completions is sorted by string length:
...
else {
   # user entered a typo, perhaps?
}