"Scalogram" validity in different word game dictionaries

Dictionary Validity
Scrabble US(US/Canada/Thailand - TWL/NWL) Yes
Scrabble UK(International - SOWPODS/CSW) Yes
Words with Friends(WWF) Yes

"scalogram" Definition

  1. an arrangement of items (such as problems on a test or features of speech) in ascending order so that the presence or accomplishment of an item at one level implies the presence of or the capability to accomplish items at all lower levels

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