0
T is Tuesday. TR is for Tuesday and Thursday.
The airport code for Lodja Airport is LJA.
r=0,Tr-r = 0 = r(T-1), since T != 1, then T-1 is non zero so r must be zero.
Olof Rhodin's birth name is Olof Rhodin.
Olof Krook's birth name is Olof Olsson Krook.