- Ser vs Estar: 100 sentences - Por vs Para: 100 sentences - Preterite vs Imperfect: 100 sentences - Subjunctive Triggers: 100 sentences - Personal A: 100 sentences Each session randomly selects 10 from the pool for variety. Closes #15 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>