Design and Development of A Low Cost Constant Current Constant Voltage (CCCV) Battery Charger 21451 2.609884 18419 2.240989 17202 2.092920 So according to the 1-3 steps of the algorithm we can initialize the left and right side characters, which are as follows: Right { }, left { } Now we have to take the decision in which set the 5th character will lies. The decision is depend on the step 4. 

Table 2: The association of ka( ) with some letters

Digraph Frequency Support Confidence

8316 1.011785 21.717897 8000 0.973338 20.892638 4134 0.502972 10.796271 3094 0.376438 8.080228 2062 0.250878 5.385077 1231 0.149772 3.214855 1153 0.140282 3.011151

The support and confidence of K with left item set { } is

 1.011785 21.717897

 0.502972 10.796271

(After addition) 1.514757 32.514168

So left support (cumulative) is 1.5154757 left confidence (cumulative) is 32.514168 The support and confidence of K with right item set { } is 0.973338 20.892638 0.376438 8.080228
(After addition) 1.349776 28.972866 So right support (cumulative) is 1.349776 Right confidence is 28.972866. In this example left support is greater then right support and left confidence is greater right confidence. Thus will go to right item sets. As a result the mem } and left { bers of itemsets are increased. The sets Right { } Thus all lette e according to the descending order of the frequency of r are distribute in left and right sid the letter. After executing the program we got the following two sets Right{ }
Left { }
The e most frequent occurring letter in middle row that is n we distribute the letter according to th closer to the hand as described in the algorithm at step 4. Our designed Bangla keyboard layout is below. 

Journal of Computer Science, Volume 1, Number 2, December 2007, ISSN: 1994Ȭ*6244* 113