⊂⊸(⊢+⊸⬚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.
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