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+# project euler 91
+50
+⍜-⇡0+1    # 0, 1, ... 50
+♭˙⊞ℂ      # int coords as complex nums
+⧅>2↘1     # without (0, 0), take 2 coords
+/(        #   vv for each coord pair vv
+  ⊟₃◡-    # - make tuple (P, Q, P-Q)
+  +∩°√°ℂ  # - calculate P^2, Q^2, (P-Q)^2
+  ⟜(+⊸↻1) # - sum all combinations
+  /↥=↻¯1  # - sum equal to other coord sq len?
+)⍉        #   ^^ for each coord pair ^^
+⧻⊚        # count such coord pairs