def p_global_param_str(p):
    """ global_param_str : ABANDON_LEASE_TIME
                         | ADAPTIVE_LEASE_TIME_THRESHOLD
                         | DDNS_DOMAINNAME
                         | DDNS_REV_DOMAINNAME
                         | DEFAULT_LEASE_TIME
                         | DELAYED_ACK
                         | MAX_ACK_DELAYED
                         | DYNAMIC_BOOTP_LEASE_CUTOFF
                         | DYNAMIC_BOOTP_LEASE_LENGTH
                         | FILENAME
                         | LEASE_FILE_NAME
                         | LIMIT_ADDRS_PER_IA
                         | DHCPV6_LEASE_FILE_NAME
                         | LOCAL_PORT
                         | LOCAL_ADDRESS
                         | LOG_FACILITY
                         | MAX_LEASE_TIME
                         | MIN_LEASE_TIME
                         | MIN_SECS
                         | NEXT_SERVER
                         | OMAPI_PORT
                         | PID_FILE_NAME
                         | DHCPV6_PID_FILE_NAME
                         | PING_TIMEOUT
                         | PREFERRED_LIFETIME
                         | REMOTE_PORT
                         | SERVER_IDENTIFIER
                         | SERVER_DUID
                         | SERVER_NAME
                         | SITE_OPTION_SPACE
                         | VENDOR_OPTION_SPACE
    """
    p[0] = p[1]
