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+# SRFI 111 - Boxes
+
+The `(srfi 111)` library ...
+
+See the [SRFI document](http://srfi.schemers.org/srfi-111/srfi-111.html) for more information.
+
+##- [`and-let*`](#and-let)
+##
+###and-let*
+##    (and-let* (claws) body
+##
+##    claws ::= '() | (cons claw claws)
+##    claw  ::=  (variable expression) | (expression) |
+##               bound-variable
+##
+##- The `claws` are evaluated in the strict left-to-right order
+##- For each `claw`, the `expression` part is evaluated first (or `bound-variable` is looked up)
+##- If the result is #f, `and-let*` immediately returns #f
+##- Otherwise, if the `claw` is of the form `(variable expression)` the `expression`'s value is bound to a freshly made `variable`
+##- The `variable` is available for the rest of the `claws` , and the `body`
+##- As usual, all `variable`s must be unique (like in `let*`)