got the start of a good intro tutorial, but its lacking some good, simple exercises

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diff --git a/doc/tutorials/intro/13.ordering_messages.pd b/doc/tutorials/intro/13.ordering_messages.pd
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+#N canvas 542 117 623 439 12;
+#X obj 10 10 cnv 15 400 40 empty empty ordering_messages 20 12 0 24
+-228992 -66577 0;
+#X msg 395 249 now;
+#X msg 316 250 this;
+#X msg 237 250 makes;
+#X msg 158 250 sense;
+#X msg 80 250 !;
+#X msg 276 391 sense now this;
+#X obj 157 292 symbol;
+#X msg 159 151 bang;
+#X msg 10 177 bang;
+#X msg 157 316 add2 \$1;
+#X msg 478 248 set;
+#X obj 160 178 trigger bang bang bang bang bang bang;
+#X text 10 393 look here for the result -->;
+#X text 10 62 Officially \, the execution order in Pd is undefined.
+;
+#X text 10 88 The [trigger] object allows you to specify the order
+of messages are sent. If you need to make sure that one thing runs
+before another \, use [trigger]:;
+#X connect 1 0 7 0;
+#X connect 2 0 7 0;
+#X connect 3 0 7 0;
+#X connect 4 0 7 0;
+#X connect 5 0 7 0;
+#X connect 7 0 10 0;
+#X connect 8 0 12 0;
+#X connect 9 0 3 0;
+#X connect 9 0 5 0;
+#X connect 9 0 11 0;
+#X connect 9 0 4 0;
+#X connect 9 0 1 0;
+#X connect 9 0 2 0;
+#X connect 10 0 6 0;
+#X connect 11 0 6 0;
+#X connect 12 0 5 0;
+#X connect 12 1 4 0;
+#X connect 12 2 3 0;
+#X connect 12 3 2 0;
+#X connect 12 4 1 0;
+#X connect 12 5 11 0;