Teaching ladder LinkedIn Crossclimb #868: students solve 5 clues before touching order. Answers: BARK, LARK, LACK, LICK, PICK. Only then drag rungs until each neighbor differs by exactly one letter.
Middle phase answers: "Outside covering of a tree" = BARK; "Songbird whose name completes the phrase “on a ___”, meaning to do something impulsively or just for fun" = LARK; "Shortage or absence of something" = LACK; "Short taste, as of a lollipop" = LICK; "Choose between a few options" = PICK.
Ordering phase: the valid middle chain is BARK → LARK → LACK → LICK → PICK. This permutation is the only valid one-letter chain for these answers.
Rule demo: BACK and BARK differ in exactly one slot — C→R at the third letter (BACK → BARK).
Rule demo: BARK and LARK differ in exactly one slot — B→L at the first letter (BARK → LARK).
Rule demo: LARK and LACK differ in exactly one slot — R→C at the third letter (LARK → LACK).
Rule demo: LACK and LICK differ in exactly one slot — A→I at the second letter (LACK → LICK).
Rule demo: LICK and PICK differ in exactly one slot — L→P at the first letter (LICK → PICK).
Rule demo: PICK and PACK differ in exactly one slot — I→A at the second letter (PICK → PACK).
Lesson complete: BACK → BARK → LARK → LACK → LICK → PICK → PACK. Remember — middles first, order second, combo last.