{\varepsilon}-x}^{0-{\varepsilon}-y}F\downharpoonright_{E_{xyz}} + \int_{0-{\varepsilon}-y}^{0/0+{\varepsilon}}F\downharpoonright_{S_{xyz}}+ \int_{0/0+{\varepsilon}}^{0/0-x-y}F\downharpoonright_{T_{xyz}}