Strang

a_i
 0.000000000000000000
 0.000000000000000000
 1.000000000000000000
b_i
 0.000000000000000000
 0.500000000000000000
 0.500000000000000000
c_i
 0.500000000000000000
 0.000000000000000000
 0.500000000000000000