array algorithm help!!

hello there..

i have this algorithm and i'm trying to find a direction in solving it..

L, R and Data are one-dimensional arrays. each with 5 elements numbered from 1 to 5. the contents of the three arrays are shown below.

L R Data
1 2 3 DOG
2 0 4 BEAR
3 5 0 HORSE
4 0 0 CAT
5 0 0 GIRAFFE

in these arrays L(3) contains the number 5, R(2) contains the number 4 and Data(1) contains the data DOG.

this is the algorithm..

T = 0
P = 1
REPEAT
WHILE P < > 0 DO
T = T + 1
S(T) = P
END WHILE
IF T > 0 THEN
FINISHED = FALSE
P = S(T)
T = T - 1
OUTPUT DATA(P)
P = R(P)
ELSE
FINISHED = TRUE
END IF
UNTIL FINISHED
EXIT

and have to trace the table below. it is only necessary to enter values in the table when they change.

T P S(1) S(2) Finished Output
0 1
1 1
2
2 2
0 FALSE
2

thats it..and i'll be gratefull for any help
bye all

hello again..

sorry but the last table was posted wrong
here it is again..

T P S(1) S(2) Finished Output
0 1 - - - -
1 - 1 - - -
- 2 - - - -
2 - - 2 - -
- 0 - - FALSE -
- 2 - - - -

i have to complete the trace table. it is only necessary to enter values in the table when they change. i should work from left to right and top to bottom. the first six lines are completed.

thanx again