What value is contained in $t$3?$

addi $t$1$ $zero, $2$

addi $t$2,$ $zero, $4$

addi $t$3,$ $zero, $6$

L$1$: beq $t$2,$ $zero, L$2$

sub $t$2,$ $t$2,$ $t$1$

add $t$3,$ $t$3,$ $t$3$

j L$1$

L$2$: