echo 1--2\n2--3\n2--4\n4--1\n5 | catgraph

echo -e '{ "id": 1, "val": 5, "name": "a" }--{ "id": 2, "val": 3, "name": "b" }\n{ "id": 3, "val": 2, "name": "a" }' | catgraph