|------------------------------------
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|---1--2-----2--1--------2---1---0---


|------------------------------------
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|--2---1---0----------1---2-----2---1-


|------------------------------------
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|-------1---------------1--------3-2-
|--1--2---2-1--0-0-0-1-2--2-1-0------


|------------------------------------
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|---------------------------------7--
|-------------------0--2--1--0----7--
|------1------------0--2--1--0----7--
|--1-2---2-1-0------0--2--1?-0-------


|------------------------------------
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|-------1---------------1--------3-2-
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|------------------------------------
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|------------------------------------
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|1--2----2--1--0--0--0--1--2----2--0-


|------------------------------------
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|1-2--2-1-2----1--2---2-1-2------1?2

|------------------------------------
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|-------------------------------------
|---2--1--2---1--2----2--1--2--1-2---2