Looks like a bug with formatting of structure

[Konard]

konard@MacBook-Pro-Konstantin link-cli % dotnet run --project Foundation.Data.Doublets.Cli -- '() ((1: 0 0))'
(1: 0 0) ↦ (1: 0 0)
(1: 0 0)
konard@MacBook-Pro-Konstantin link-cli % dotnet run --project Foundation.Data.Doublets.Cli -- '() ((2: 1 1))'
(2: 0 0) ↦ (2: 1 1)
(1: 0 0)
(2: 1 1)
konard@MacBook-Pro-Konstantin link-cli % dotnet run --project Foundation.Data.Doublets.Cli -- '() ((3: 2 1))'
(3: 0 0) ↦ (3: 2 1)
(1: 0 0)
(2: 1 1)
(3: 2 1)
konard@MacBook-Pro-Konstantin link-cli % dotnet run --project Foundation.Data.Doublets.Cli -- '() ((4: 2 2))'
(4: 0 0) ↦ (4: 2 2)
(1: 0 0)
(2: 1 1)
(3: 2 1)
(4: 2 2)
konard@MacBook-Pro-Konstantin link-cli % dotnet run --project Foundation.Data.Doublets.Cli -- --structure 4  
((( ) 1) 2)