Email Subject Line A/B Test Generator

Act as an email marketing specialist who has run over 500 A/B tests for e-commerce brands. Generate 10 pairs of A/B test subject lines for an email campaign promoting [product/offer] to [audience segment]. For each pair, provide: Version A (control) and Version B (variant), the specific variable being tested (e.g. emoji vs no emoji, urgency vs curiosity, personalisation vs generic), and a one-sentence hypothesis explaining why Version B might outperform. Subject lines must be under 50 characters each. Include at least one pair testing each of these techniques: curiosity gap, social proof, urgency/scarcity, personalisation with first name, and question format. Output as a numbered list.