symmetric 2-design
type: Concept
preferred label: 2-طرح متقارن @fa
related: symmetric block design

quasi-symmetric block design
type: Concept
preferred label: طرح بلوکی شبه‌متقارن @fa
related: symmetric block design

symmetric block design
type: Concept
broader: block design
preferred label: طرح بلوکی متقارن @fa
related: symmetric 2-design
related: quasi-symmetric block design

block design
type: Concept
narrower: symmetric block design
preferred label: طرح بلوکی @fa