# Before you spoke — solution

The chosen pane bears a **swan in clear glass**.

Mira’s first line excludes the amber lark: a person told “lark” would know the pane immediately. Eight possibilities remain publicly, but each remaining bird still has two kinds of glass.

Ivo says he knew Mira would be uncertain **before** she spoke. If he had been told “amber,” he would originally have considered the lark possible. In that case he could not have known she would be uncertain. His glass is therefore blue or clear.

Five possibilities survive: blue wren, blue swift, clear swan, blue owl, clear owl.

Mira can now identify the pane. She cannot have been told “owl,” since both owl panes remain. The public shortlist is now blue wren, blue swift, clear swan.

Ivo can identify the pane too. A blue pane would still leave him choosing between wren and swift. Clear leaves only swan.

## The altered line

“I know that now” adds nothing beyond Mira’s public admission. It does not say Ivo knew anything about her uncertainty beforehand. After the first line, each remaining bird still has two glass possibilities. Mira learns no new distinction from Ivo’s weaker line, so her subsequent “Now I can tell” cannot be true. No pane fits the altered conversation.

This is not just another answer to the same table. It is an inconsistent transcript under the stated rules.

## Hint ladder

1. Is any bird paired with only one kind of glass?
2. Put yourself in Ivo’s place before the conversation starts. Could he have been told amber and still been certain Mira would not know?
3. After amber is excluded, which bird still has two possible panes?
4. Of the three panes left after Mira knows, which kind of glass identifies just one?

## Scope of the reasoning

The table is complete, the pair stays fixed, the messages are public and truthful, and both speakers know the table and reasoning assumptions. No probabilities or guessing are needed. A claim that a speaker knows is stronger than the speaker announcing a lucky correct answer. The wording does not grant additional information from timing, silence, tone or a promise about what would have happened in another conversation.