Two 5×5 squares, no J. Digraphs. Left letter from the STAR square, right letter from the SHIP square. Cipher pair: same row as the left letter in the right square, same column as the right letter; then same row as the right letter in the left square, same column as the left letter.
STAR square:
S T A R B

C D E F G
H I K L M
N O P Q U
V W X Y Z
SHIP square:
S H I P A
B C D E F
G K L M N
O Q R T U
V W X Y Z
FSHDMNMCHSMT
Twelve letters, three words restored.

The paper
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