Count specific patterns in data frame in R

I have a dataset in data frame format, like this:

wpt    ID   Fuel  Express   Local
 1     S36   12      0         1
 2     S36   14      1         0
 inter S36   NA      1         0
 inter S36   NA      1         0
 3     S36   16      1         0
 inter S36   NA      0         0
 4     S36   12      1         0
 5     S36   12      1         0

I'd like to treat the subdata dat[c(2,inter,inter,3),] (any part with "inter" combined with regular numbered wpt)as a unit.

(1) count how many such sub-units in my data frame, in this case it has two (unit with row from 2 to 3, and 3 to 4)

(2) then count how many such units with Express or Local value of rows with "inter" different from either the starting or ending value of the sub-unit. In this case, it has 1 such unit consistent and 1 unit different from the starting or ending value of such units.

Thanks in advance!