Artifidal life based on simulation evolution is a flourishing field. One o£ its most publicized achieveznents of the nineties was TIF_,ILRA, by T.S. Ray. APL2 has been used successfully to implement a simiLar simpler awdficial life application that shows most of the interesting features of TI~.RRA in an efficient way, providing a modifiable environment where it is easy to experiment. Permission to make digital or hard copies of all or part of this work for personal or classroom use Is granted

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