Syntax
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-Insert all the implicit `( )`s and <code>λ</code>s into the following abbreviated expressions.
+Insert all the implicit `( )`s and <code>λ</code>s into the following abbreviated expressions. Don't just insert them *freely*; rather, provide the official expression, without any notational shortcuts, that is syntactically identical to the form presented.
+
+*In response to your feedback and questions, we refined the explanation of the conventions governing the use of the `.` shorthand. Thanks!*
1. `x x (x x x) x`
<code><b>(((</b>x x<b>)</b> (<b>(</b>x x<b>)</b> x)<b>)</b> x<b>)</b></code>