diff --git a/2/main.ua b/2/main.ua
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+# project euler 2
+↘1⍢(
+  ⊂⊸(⊢+⊸⬚0↻1↙2) # generate next term from last two \
+| <4e6⊢         # until we shoot over 4000000.
+) [1 1]         # start with 1, 1 for fib. seq.
+▽¬⊸◿₂           # filter on even.
+/+              # sum.