@c = (uc join ' ', qw<
add 1  alter 3  backup 2  bottom 1  Cappend 2  change 1  Schange  Cinsert 2  Clast 3
compress 4 copy 2 count 3 Coverlay 3 cursor 3  delete 3 Cdelete 2  down 1  duplicate
3 xEdit 1 expand 3 extract 3  find 1 Nfind 2 Nfindup 6 NfUP 3 Cfind 2 findUP 3 fUP 2
forward 2  get  help 1 hexType 4  input 1 powerInput 3  join 1 split 2 spltJOIN load
locate 1 Clocate 2 lowerCase 3 upperCase 3 Lprefix 2  macro  merge 2 modify 3 move 2
msg  next 1 overlay 1 parse preserve 4 purge 3 put putD query 1 quit  read recover 3
refresh renum 3 repeat 3 replace 1 Creplace 2 reset 3 restore 4 rgtLEFT right 2 left
2  save  set  shift 2  si  sort  sos  stack 3 status 4 top  transfer 3  type 1  up 1
>) =~ /([a-zA-Z]+(?:\s+\d+)?)(?=\s+[a-zA-Z]|$)/g;

my %abr = ('' => '', ' ' => '');
for (@c) {
    ($w,$sl) = split ' ', $_;
    $ll = length($w);
    $sl = $ll unless $sl;
    $abr{substr($w,0,$sl)} = $w;
    map { $abr{substr($w, 0, $_)} = $w } $sl .. $ll;
}

$fmt = "%-10s";
$inp = sprintf $fmt, 'Input:';
$out = sprintf $fmt, 'Output:';
for $str ('', qw<riG rePEAT copies put mo rest types fup. 6 poweRin>) {
    $inp .= sprintf $fmt, $str;
    $out .= sprintf $fmt, $abr{uc $str} // '*error*';
}

print "$inp\n$out\n";