Myszkowski transposition — like a columnar, except identical keyword letters share one number and are read together left-to-right, row by row, before the next number.
Keyword: STEEL
Column numbers (alphabetical; both E's are 1):

S T E E L
3 4 1 1 2
Write the plaintext row-wise under the keyword (no spaces). Then read by ascending number. Shared numbers: sweep those columns together each row before moving on.
Ciphertext (one run):
TCESHHCTIAHP
Restore spaces for the answer.

The paper
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