E.g. [[-34],[45],[56]]   [37]
     [[45],[56],[37]]    [78]
     [[56],[37],[78]]    [65]
     [[-78],[45],[36]]   [57]
     [[45], [36],[57]]   [89]
     ....

[[1],[-34],[45],[56]]   [37]
[[1],[45],[56],[37]]    [78]
[[1],[56],[37],[78]]    [65]
[[2],[-78],[45],[36]]   [57]
[[2],[45], [36],[57]]   [89]
 ....