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11 different matching expressions found:

titokban by stealth (Correction)
furtively (Correction)
hugger-mugger (Correction)
in private (Correction)
in secret (Correction)
on the q.t. (Correction)
on the quiet (Correction)
on the sly (Correction)
privily (Correction)
stealth (Correction)
stealthily (Correction)

Searching the extension dictionary:

2 different matching expressions found:

titokban surreptitiously (Correction)
under cover (Correction)
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