The ability to use a counter exists primarily to facilitate fixed
time experiments where the subject only gets a certain time to respond to as
many items as they can:
+250 <set c1=50000> <t c1> "#########"/*"RELUCTANT"/;
+250 <set c1=c1-lastrt> <t c1> "#########"/*"LANDSCAPE"/ <bi 999,c1 .le. 0>;
-250 <set c1=c1-lastrt> <t c1> "#########"/*"CORTINDON"/ <bi 999,c1 .le. 0>;
-250 <set c1=c1-lastrt> <t c1> "#########"/*"SPORINTIC"/ <bi 999,c1 .le. 0>;
...
999 L "End of Experiment";
DMDX Index.