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open

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backdoor backstairs camouflaged clandestine classified cloak-and-dagger close confidential covert cryptic discreet disguised dissimulated furtive hush-hush in ambush incognito inside restricted secretive sly sneak sneaky

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aboveboard forthright honest known open public

clear defined explicit legal legitimate revealed unconcealed

difficult hazardous icy ominous perilous precarious risky slippery ticklish tricky unreliable unsafe unstable

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