Writing: 文
文 is an old component associated with writing, patterns, and culture. The characters in this small family share 文 visually, but their meanings range from 斐 (“beautiful, patterned”) to 斎 (“purification”) and 斉 (“equal”); the component does not define them all.
斉 has 8 strokes, while 斎 has 11 and 斐 has 12; watch their different upper shapes.