A3b) 14.Sept07
public text v1 · immutable a & ( b & ( c & ( d & 1 + !d & 1 ) + !c & ( d & 1 + !d & 0 ) ) + !b & ( c & ( d & 0 + !d & 0 ) ) + !c & ( d & 1 + !d & 0 ) ) ) ) +
!a & ( b & ( c & ( d & 1 + !d & 0 ) + !c & ( d & 1 + !d & 0 ) ) + !b & ( c & ( d & 1 + !d & 0 ) ) + !c & ( d & 1 + !d & 0 ) ) ) )