#!/usr/bin/perl

sub strip_plurel() 
{
    local $_ = $_[0];
    my @l;
    push @l, "$1y" if /^(.+)[iI]es$/;
    push @l, $1    if /^(.+)es$/;
    push @l, $1    if /^(.+?)\'?s$/;
    return @l;
}

# STDIN contains the the list of words which contain the base forms

while (<STDIN>) {
    print unless $ARGV[1] eq "noecho";
    chop;
    $lookup{$_} = 1;
}

# ARGV[0] is the file of words with possible 's's that we want to 
# extract provided the base from is was in the above list

open IN, $ARGV[0] or die;

while (<IN>) {
    chop;
    my $print = 0;
    foreach $s (&strip_plurel($_)) 
    {
	if (exists $lookup{$s}) 
	{
	    $print = 1;
	}
    }
    print "$_\n" if $print;
}