Trace the values of this code. If a variable is not yet defined, put an $"$X$"($without quotes$).$

$1|$ L $=[2,1]$

$2|$ t $=4$

$3|$ for i in L:

$4|$ p $=$ t $-$ i

$5|$ t $=4-$ p

step line L i p t

$11[2,1]$ X X X

$22[2,1]$

X

$33[2,1]$

X

$44[2,1]$

$2$

$5$

$[2,1]$

$6$

$7$

$[2,1]$

$8$

$[2,1]$

$3$