# Reduce mode
-There are two variants here. The first is when the destination is scalar and at least one of the sources is Vector. The second is more complex and involves map-reduction on vectors.
-
-The first defining characteristic distinguishing Scalar-dest reduce mode from Vector reduce mode is that Scalar-dest reduce issues VL element operations, whereas Vector reduce mode performs an actual map-reduce (tree reduction): typically `O(VL log VL)` actual computations.
+There are two variants here. The first is when the destination is scalar
+and at least one of the sources is Vector. The second is more complex
+and involves map-reduction on vectors.
+
+The first defining characteristic distinguishing Scalar-dest reduce mode
+from Vector reduce mode is that Scalar-dest reduce issues VL element
+operations, whereas Vector reduce mode performs an actual map-reduce
+(tree reduction): typically `O(VL log VL)` actual computations.
The second defining characteristic of scalar-dest reduce mode is that it
is, in simplistic and shallow terms *serial and sequential in nature*,