def generate_emails(self, domain, first_name, last_name):
        """
        docstring for generate_emails
        """
        email_list = []
        fn_initial = first_name[:1]
        ln_initial = last_name[:1]

        email_list.append(['{}@{}'.format(first_name, domain)])
        email_list[0].extend(
            [
                '{}@{}'.format(last_name, domain),
                '{}{}@{}'.format(first_name, last_name, domain),
                '{}.{}@{}'.format(first_name, last_name, domain),
                '{}{}@{}'.format(fn_initial, last_name, domain),
                '{}.{}@{}'.format(fn_initial, last_name, domain),
                '{}{}@{}'.format(first_name, ln_initial, domain),
                '{}.{}@{}'.format(first_name, ln_initial, domain),
                '{}{}@{}'.format(last_name, first_name, domain),
                '{}.{}@{}'.format(last_name, first_name, domain),
                '{}{}@{}'.format(last_name, fn_initial, domain),
                '{}.{}@{}'.format(last_name, fn_initial, domain),
                '{}{}@{}'.format(ln_initial, first_name, domain),
                '{}.{}@{}'.format(ln_initial, first_name, domain),
                '{}{}@{}'.format(ln_initial, fn_initial, domain),
                '{}-{}@{}'.format(first_name, last_name, domain),
                '{}-{}@{}'.format(fn_initial, last_name, domain),
                '{}-{}@{}'.format(first_name, ln_initial, domain),
                '{}-{}@{}'.format(last_name, first_name, domain),
                '{}-{}@{}'.format(last_name, fn_initial, domain),
                '{}_{}@{}'.format(first_name, last_name, domain),
                '{}_{}@{}'.format(fn_initial, last_name, domain),
                '{}_{}@{}'.format(first_name, ln_initial, domain),
                '{}_{}@{}'.format(last_name, first_name, domain),
                '{}_{}@{}'.format(last_name, fn_initial, domain),
                '{}_{}@{}'.format(ln_initial, first_name, domain),
            ])
        email_list.append(
            [
                '{}{}@gmail.com'.format(first_name, last_name),
                '{}.{}@gmail.com'.format(first_name, last_name),
                '{}{}@gmail.com'.format(fn_initial, last_name),
                '{}.{}@gmail.com'.format(fn_initial, last_name),
                '{}{}@gmail.com'.format(first_name, ln_initial),
                '{}.{}@gmail.com'.format(first_name, ln_initial),
                '{}{}@gmail.com'.format(last_name, first_name),
                '{}.{}@gmail.com'.format(last_name, first_name),
                '{}{}@gmail.com'.format(ln_initial, first_name),
                '{}.{}@gmail.com'.format(ln_initial, first_name),
                '{}-{}@gmail.com'.format(first_name, last_name),
                '{}-{}@gmail.com'.format(fn_initial, last_name),
                '{}-{}@gmail.com'.format(first_name, ln_initial),
                '{}-{}@gmail.com'.format(last_name, first_name),
                '{}-{}@gmail.com'.format(last_name, fn_initial),
                '{}_{}@gmail.com'.format(first_name, last_name),
                '{}_{}@gmail.com'.format(fn_initial, last_name),
                '{}_{}@gmail.com'.format(first_name, ln_initial),
                '{}_{}@gmail.com'.format(last_name, first_name),
            ])

        return {
            'domain': domain,
            'first_name': first_name,
            'last_name': last_name,
            'emails': {
                'custom_domain': email_list[0],
                'gmail.com': email_list[1]
            }
        }