* blk_num number of blocks that S[h] will be splitted into;
* s012 number of items that fall into splitted nodes.
* lbytes number of bytes which flow to the left neighbor from the
- * item that is not not shifted entirely
+ * item that is not shifted entirely
* rbytes number of bytes which flow to the right neighbor from the
- * item that is not not shifted entirely
+ * item that is not shifted entirely
* s1bytes number of bytes which flow to the first new node when
* S[0] splits (this number is contained in s012 array)
*/