Question $2$

$12\mathrm{.}5pts$

The following is a message that I encrypted using ADTC. How many rows $($i$.$e$.,$ horizontal lines$)$ did I use? $($NOTE: the "I" character is an uppercase $"i",$ not a lowercase $\text{'}L\text{'}.)$

NOBTPIBRHHCYOEEEOKCRJUEI

$2$

$3$

$4$

$5$

$6$