These principal letters are divided into four series -LRB- `` témar '' -RRB- that correspond to the main places of articulation and into six rows -LRB- `` tyeller '' -RRB- that correspond to the main manners of articulation .

The main tengwar letters are placed into four vertical series -LRB- témar -RRB- and six horizontal rows -LRB- tyeller -RRB- .
