the intelligence agency hiddenly monitored the suspect's communications for months.
she hiddenly observed the conversation from behind the curtain.
the security camera hiddenly recorded everything that happened in the office.
he hiddenly followed the stranger through the crowded market streets.
the spy hiddenly gathered intelligence about the enemy's military plans.
the tracking software hiddenly logged users' browsing history without detection.
she hiddenly listened to their private conversation through the thin wall.
the criminal organization hiddenly operated in multiple countries under false names.
he hiddenly conveyed the secret message to his partner during the meeting.
the surveillance device hiddenly functions by detecting subtle temperature variations.
they hiddenly collected personal data from thousands of unsuspecting users.
the government hiddenly funded the classified research program for years.
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