Classification target LinkedIn Crossclimb #779. Ladder width: 4. Middle samples: TENT, TENS, TINS, TINE, TUNE. Combo label: "A two-word phrase for a glass vessel used to hold or mix substances for a scientific experiment.". Full chain: TEST → TENT → TENS → TINS → TINE → TUNE → TUBE.
Middle phase answers: "Shelter set up when camping" = TENT; "Column to the left of the "ones", in whole numbers" = TENS; "Metal containers for food named for a chemical element" = TINS; "Prong on a fork" = TINE; "What a whistler might whistle" = TUNE.
Ordering phase: the valid middle chain is TENT → TENS → TINS → TINE → TUNE. This permutation is the only valid one-letter chain for these answers.
Transition 1: S→N at the third letter (TEST → TENT).
Transition 2: T→S at the fourth letter (TENT → TENS).
Transition 3: E→I at the second letter (TENS → TINS).
Transition 4: S→E at the fourth letter (TINS → TINE).
Transition 5: I→U at the second letter (TINE → TUNE).
Transition 6: N→B at the third letter (TUNE → TUBE).
Ladder result: TEST → TENT → TENS → TINS → TINE → TUNE → TUBE. Classification: unique middle order.