x1=k1=r1=z2 is a cryptic organism/stealth object/having the ability to avoid observation/detection by x2=z1=r2=k2 via senses/means (observer) x3=z3 through action/state x4=r3 (event) under conditions x5=z4=k3.
x4 methods include camouflage (=ticta'u), nocturnality (=ctenalcando), subterranean lifestyle (=tumsfeni'a), transparency (=klina), and mimicry.