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using Makie
import AbstractPlotting: plot!

@recipe(Band, x, ylower, yupper) do scene
    Theme(;
    default_theme(scene, Mesh)...,
    color = RGBAf0(1.0,0,0,0.2)
    )
end

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function interleave1(args::NTuple{N,Vector{T}}...) where {N,T}
    n = minimum(length.(args))
    c = Vector{T}(undef, length(arg)*n)
    i = 0
    for x in zip(args...)
        for y in x
            c[i += 1] = y
        end
    end

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"""
    @unroll1 for-loop

Unroll the first iteration of a `for`-loop.
Set `$first` to true in the first iteration.

Example:
```
    @unroll1 for i in 1:10
        if $first

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struct State{P}
    q::Vector{P}
    p::Vector{P}
end
q(x::State) = x.q
p(x::State) = x.p
q(x::State, i) = x.q[i]
p(x::State, i) = x.p[i]

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Axes

Axes can be realised as special margins or be displayed in the plot.

Elements of an axis

• Axis location (at one of the margins or within the plot)
• Axis lines
• (Axis) arrows with arrowhead
• Axis label, attached to or detached from arrow-head, e.g. measured quantity and unit

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struct DZip{S,T}
  X::S
  Y::T
end
struct Start
end
struct End{T}
    state::T
end

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struct Stack{I,F}
    iter::I
    f::F
end
import Base.iterate


function iterate(S::Stack) 
    ϕ = iterate(S.iter)