{
  "representation": "qualitative geometry only; arrows encode routes, no quantities",
  "alternatives": [
    {
      "id": "continuation-side-branch",
      "inlet_approach": "continues toward B; side branch toward A",
      "source_mechanism": "liquid momentum favors B and vapor resistance preference favors A in matching-duty/pressure-drop teaching example",
      "performance_prediction": null
    },
    {
      "id": "midpoint-opposed",
      "inlet_approach": "enters horizontal branch midway between A and B",
      "contribution": "removes illustrated straight-through preference; enables comparison of opposing branches",
      "equal_phase_guarantee": false
    }
  ],
  "evaluation_conditions": [
    "inlet pressure/temperature/phase",
    "approach direction",
    "branch elevations/losses",
    "equipment duties/internal resistance",
    "operating combinations"
  ]
}