LISA WRC+rel+acq-o+o-rb-o { x = 0; y = 0; } P0 | P1 | P2 ; w[release] y 1 | r[acquire] r3 y | r[once] r1 x ; | | f[rmb] ; | w[once] x 1 | r[once] r2 y ; Observed 2:r2=0; 2:r1=1; 1:r3=1;