\text{a: list of spline polynom variables \\
X: list of points in spreadsheet\\
Ps(x): list of spline polynoms\\
dPs(x): list of 1. derivation\\
ddPs(x): list of 2. derivation\\
A03: Ps_{1..4}(A(1..4)_{x})=A(1..4)_{y} departing polynomial \\
A14: Ps_{1..4}(A(2..5)_{x})=A(2..5)_{y} arriving polynomial\\
S13: slope of the arrivial polymon is equal to the slope of the leaving polynom\\
K13: curvature of the polynom is equak to the curvature of the leaving polynom\\
R15: boundary condition of starting and ending polynom
}
