/dt><dt class="spec value" id="val-spaces"><a href="#val-spaces" class="anchor"></a><code><span class="keyword">val</span> spaces : int <span>&#45;&gt;</span> string</code></dt><dt class="spec value" id="val-replace_assoc"><a href="#val-replace_assoc" class="anchor"></a><code><span class="keyword">val</span> replace_assoc : <span class="type-var">'a</span> <span>&#45;&gt;</span> <span class="type-var">'b</span> <span>&#45;&gt;</span> <span><span>(<span class="type-var">'a</span> * <span class="type-var">'b<