Editing Nonogram (section)

===Joining and splitting===
Boxes closer to each other may be sometimes joined together into one block or split by a space into several blocks. When there are two blocks with an empty cell between, this cell will be:
* A space if joining the two blocks by a box would produce a too large block
* A box if splitting the two blocks by a space would produce a too small block that does not have enough free cells remaining

For example, considering a row of fifteen cells with boxes in the third, fourth, sixth, seventh, eleventh and thirteenth cell and with clues of ''5'', ''2'' and ''2'':
[[File:Paint by numbers - Solving - Example7.png|right]]
* The clue of ''5'' will join the first two blocks by a box into one large block, because a space would produce a block of only 4 boxes that is not enough there.
* The clues of ''2'' will split the last two blocks by a space, because a box would produce a block of 3 continuous boxes, which is not allowed there.
''Note:'' The illustration picture also shows how the clues of ''2'' are further completed. This is, however, not part of the ''Joining and splitting'' technique, but the ''Glue'' technique described above.