Determine the loop‐carried (inter‐iteration) dependencies in the following loop

Determine the loop‐carried (inter‐iteration) dependencies in the following loop and rewrite it so that it is parallel. How many cycles would it take to execute this loop on a system with 10 processors, assuming addition takes only one cycle.

for (i = 1; i<=99; i++) {
a[i] = b[i] + c[i]; /S1/
b[i] = a[i] + d[i]; /S2/
a[i+1] = a[i] + e[i]; /S3/
}