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# eventuele imports
# invoer
x1 = float(input("x_1: "))
y1 = float(input("y_1:"))
z1 = float(input("z_1: "))
x2 = float(input("x_2:"))
y2 = float(input("y_2: "))
z2 = float(input("z_2: "))
# berekeningen
# uitvoer
print(f"De 3D-afstand is {d:.2f}.")