Which proposition is emphasized by “inna al-khaṭṭa mutashābihun”?

Supplementary Practice 13: Attribution, Quotation and Evidential Restraint in Rhetorical Analysis

• Resemblance and definite authorship are both asserted automatically
• Resemblance of the handwriting, not definite authorship
• Resemblance to all other writing is explicitly excluded
• The differing seal is denied and authorship affirmed