[Graphics:calc4-12_1gr2.gif][Graphics:calc4-12_1gr1.gif]

[Graphics:calc4-12_1gr2.gif][Graphics:calc4-12_1gr3.gif]

[Graphics:calc4-12_1gr2.gif][Graphics:calc4-12_1gr4.gif]
[Graphics:calc4-12_1gr2.gif][Graphics:calc4-12_1gr5.gif]