mcnp parsing test file
1 1 -2.0   1 -2 3  imp:N=1
2 2 -3.5   1 (-2:3 4) vol=1
3 0        2 #2 #(-1:3) imp:N,P=1
4 LIKE 1 BUT RHO -3.0
5 0        -5 -6 imp:N=1

1 1 SX 4 +5.0
*2 PX 1
3 S 1 2 -3 +4
4 PY -5.0
5 RCC 0 0 0 1 0 0 5
6 BOX -1 -1 -1 2 0 0 0 2 0 0 0 2

mode N P
m1 1001 0.1 1002 0.9
m2 6012.50c -0.5 8016.21c -0.5
m3 1001 0.1 1002 0.9 gas=1
m4 1001 0.1 1002 -0.9 gas=1 nlib=50c
tr1 1 2 3
