<jupyter_start><jupyter_text>15. Lazy evaluation  15.1 Introduction  15.2 Evaluation strategies  15.3 Termination  15.4 Number of reductions  15.5 Infinite structures<jupyter_code>ones :: [Int]
ones = 1 : ones
head ones<jupyter_output><empty_output><jupyter_text>15.6 Modular programming<jupyter_code>take 3 ones<jupyter_output><empty_output>
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