
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
A signboard measures $6$ units by $18$ units. The word "LAST" is painted in block letters, each with strokes $1$ unit wide. Calculate the white area remaining on the sign, assuming all gaps and margins are negligible.
A) 67.5 square units
B) 68.5 square units
C) 69.5 square units
D) 70.5 square units
E) 71.5 square units

Present the answer in LaTex format: \boxed{Your answer}
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