Classification target LinkedIn Crossclimb #829. Ladder width: 4. Middle samples: CODE, MODE, MOLE, HOLE, HONE. Combo label: "Two words with opposite meanings that often appear together idiomatically, as in the sentence “The opportunity has ___ and ___.”". Full chain: COME → CODE → MODE → MOLE → HOLE → HONE → GONE.
Middle phase answers: "A system to encrypt words to send a secret message" = CODE; "The most frequently appearing value in a data set" = MODE; "Burrowing animal, or a unit of measurement in chemistry" = MOLE; "Something that can be dug in the ground" = HOLE; "Sharpen, as one’s skills" = HONE.
Ordering phase: the valid middle chain is CODE → MODE → MOLE → HOLE → HONE. This permutation is the only valid one-letter chain for these answers.
Transition 1: M→D at the third letter (COME → CODE).
Transition 2: C→M at the first letter (CODE → MODE).
Transition 3: D→L at the third letter (MODE → MOLE).
Transition 4: M→H at the first letter (MOLE → HOLE).
Transition 5: L→N at the third letter (HOLE → HONE).
Transition 6: H→G at the first letter (HONE → GONE).
Ladder result: COME → CODE → MODE → MOLE → HOLE → HONE → GONE. Classification: unique middle order.