Solution
= Solution
\b[TODO: The <gas> in D and the <gas> in E remain unidentified.] Neither bottle nor any observations of its contents are available. There is no basis for assigning a particular <gas> to either bottle.
= Solution
\b[TODO: The <gas> in D and the <gas> in E remain unidentified.] Neither bottle nor any observations of its contents are available. There is no basis for assigning a particular <gas> to either bottle.