here is the o/p after running above:
i       :405
size w  :2
w       : 'severe'| 'sunburn'
w[0]    : severe
w[1]    : sunburn
size w  :2
t1      : severe
t2      : sunburn
raw  cu1:ARRAY(0x1dcf698)
size cu1:0
cu1     :
new  cu1:ARRAY(0x1dcf698)
raw  cu2:ARRAY(0x1dcf6e0)
size cu2:0
cu2     :
new  cu2:ARRAY(0x1dcf6e0)