Πεψενθε
![`and`(x[D] = `+`(1, -1), `+`(1, -1) = 0)](images/m_44.gif){kind=small}
![`and`(y[D] = `+`(-2, 2), `+`(-2, 2) = 0)](images/m_45.gif){kind=small}
![`and`(z[D] = `+`(1, -3), `+`(1, -3) = -2)](images/m_46.gif){kind=small}