So to see exactly what we mean, let's take a look at the following table which basically describes which blood types we can mix and which blood types we cannot mix. So on this table, this row, the red row basically describes the blood of that individual that we are donating. While this column, the blue column basically describes the blood of that individual that is receiving that donating blood. So this is our receiver, it's the recipient and this is the person that is donating that blood. Now yes means that by mixing these two blood types we basically do not have Agglutination taking place. And so mixing is allowed.