Ol i save yusim ol narapela narapela paiplain pam long ol narapela narapela samting, na long dispela as ol i no wankain long yusim bilong ol namel long ol 'low-inlet', 'high-outlet', na 'high-inlet', 'low-outlet pam.
Ol 'low-inlet, high-outlet pam i gutpela long karim ol wara long wanpela liklik ples i go long wanpela ples antap, longwe long ples bilong en pastaim. Long narapela sait, ol 'high-inlet, low-outlet pam i gutpela long karim ol wara i kam long wanpela ples antap, longwe long ples bilong en pastaim, i go long wanpela ples daunbilo.