Word ladder: from host to nine
Word ladder: from host to nine begins with a small, precise task. Change one letter at a time and reach nine in 4 steps. The route is host -> hose -> nose -> none -> nine. Read each arrow as a separate move, rather than treating the whole line as a single change. Each move keeps the letters in their positions and replaces just one of them. The intermediate words make the journey visible, so the answer can be checked move by move.
The starting point and destination give this Word ladder its shape. Put host beside nine and compare matching positions. The positions that need a different letter are 1, 2, 3, 4. In this route, each of those changes has its own move. There is no need to move a letter from one position into another or to change the length of the word. Keep the destination available as a reference while following the intermediate words. The useful question at each arrow is narrow: which letter changes here, and which letters remain? Separating those checks makes the route easier to inspect without skipping a link.
The first move takes host to hose. Change t to e at position 4. The unchanged letters are h at position 1, o at position 2, s at position 3. Read the words side by side before moving on: the changed position accounts for the entire difference between this pair. Write the starting word, make this single replacement, and write the resulting word beside it. Keeping both words visible means the next move has a clear starting point. The first intermediate word is useful because it preserves the rest of the starting arrangement while completing one part of the route.
The next move takes hose to nose. Here, change h to n at position 1. The letters that stay in place are o at position 2, s at position 3, e at position 4. Compare this pair on its own, then connect it to the preceding pair. The word reached by the first move is the word used to begin the next one, so there is no gap between them. Follow both checks and the route remains continuous from its starting point through this next replacement.
Then nose becomes none: change s to n at position 3, keeping the other letters in place. Then none becomes nine: change o to i at position 2, keeping the other letters in place. These remaining moves finish the route at nine. Give each arrow the same attention as the earlier arrows: identify the replacement, keep the other positions fixed, and use the new word as the starting point for the following move. The final word is the requested destination, so the letter changes and the endpoint fit together. Reading only the beginning and end would hide the intermediate work. Reading the full chain shows how that work is divided into individual replacements. This makes the answer more useful than a bare endpoint because every part of the journey remains available for inspection.
Now check the complete Word ladder against the task. The chain begins with host, ends with nine, and uses 4 moves between its neighboring words. Count the arrows as moves; the starting word is the place from which the first move begins. Then compare each neighboring pair again, checking that a single position changes and every other position stays the same. The explanation of the route identifies those replacements individually. Together, the count and the letter checks establish that this particular chain meets the stated request.
Reading the Word ladder backward offers another way to inspect the same solution. The reversed chain is nine -> none -> nose -> hose -> host. Begin at nine and follow the arrows back to host. Each replacement now runs in the opposite direction, but it still affects the same position as its forward counterpart. This backward reading is a check on the given chain, rather than an additional route to the original destination. It can help keep the intermediate words connected when tracing the solution on paper. Compare adjacent pairs as before, watching the unchanged letters as carefully as the replacement. The full chain remains visible whichever direction it is read.
The method illustrated by this Word ladder is to keep the task, the intermediate words, and the checks together. Start with the stated endpoints and the requested move count. Compare letters in matching positions, then work through replacements one at a time. For this solution, the intermediate words show exactly where each move leads. Check every neighboring pair and count the moves before accepting the completed chain. If a proposed pair changes several positions at once, it does not meet the single replacement rule used here. Returning to the neighboring words keeps the check manageable. The final result is a route whose individual moves explain how host reaches nine.