--- before/pipeline.py
+++ after/pipeline.py
@@ -8,7 +8,7 @@
         return {'error': 'reversed_interval'}
     merged = []
     for start, end in sorted((a, b) for a, b in intervals if a < b):
-        if merged and start < merged[-1][1]:
+        if merged and start <= merged[-1][1]:
             merged[-1][1] = max(merged[-1][1], end)
         else:
             merged.append([start, end])