user: Question: What is the lightweight value with No information model and the flexible value is Unknown?
Columns: ['Schemas', 'Flexible', 'Semantic verification', 'Dictionary', 'Information Model', 'Synonyms and homonyms', 'Dialecting', 'Web standard', 'Transformations', 'Lightweight', 'Human readable']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Yes [1 ]', 'Yes', 'Yes', 'Yes', 'Yes', 'Yes', 'Yes', 'Yes', 'Yes', 'Yes', 'No']
SQL:

assistant: SELECT "Lightweight" FROM "Table" WHERE "Information Model" = 'No' AND "Flexible" = 'Unknown';