Email Subject Line Generator

Generate 20 email subject lines for:

Email purpose: {{purpose}}
Audience: {{audience}}
Key message: {{message}}

For each subject line:
- Keep under 50 characters (mobile-friendly)
- Label the psychological trigger used:
  a) Curiosity gap
  b) Urgency/scarcity
  c) Personal benefit
  d) Social proof
  e) Controversy/contrarian
  f) Question
  g) How-to/number
  h) Personalization
- Rate predicted open rate: ⭐ to ⭐⭐⭐⭐⭐

Provide:
- 10 options for the main send
- 5 A/B test variants
- 5 'risky but could work' options

Industry: {{industry}}
Brand tone: {{formal/casual/playful}}
Avoid: {{spam_triggers_or_words}}