2 ms·
Right, so there's one exposure regardless. You don't know who it is I suppose, but you know it's there.
by mattmaroon 16y ago
Right, so there's one exposure regardless. You don't know who it is I suppose, but you know it's there.
- gjm11 16y agoAB then CD then BC: the graph looks like A-B-C-D but there's no chain A->D or D->A that actually permits infection.