permanent
type: Concept
preferred label: دائم @fa
related: intermittent

duration
type: Concept
narrower: intermittent
preferred label: مدت @fa

occasionally
type: Concept
preferred label: گاه به گاه @fa
related: intermittent

intermittent
type: Concept
alternative label: IRREGULAR
broader: periodicity
broader: duration
preferred label: متناوب @fa
related: permanent
related: occasionally
related: regularly
scope note: IRREGULAR

regularly
type: Concept
preferred label: مرتب @fa
related: intermittent

periodicity
type: Concept
narrower: intermittent
preferred label: تناوب @fa