PB2 := {i,j,k| 0<i<5,0<j<5,0<i+j<k,0<k<5};
PB3 := {i,j,k| 0<i,0<j,10<i+j<k,10<k<15};
PB4 := {i,j,k| 10<i<13, 10<j<15, 0<k<4};
PB5 := {i,j,k| 0<i<7,0<j<5,10<k<15};
vide := { | };
initvisu (3, vide);
