$2^2+3+4$
$x^2y=x^2+4$
$\left(4a-5b^2\right)^2$
$12x<6x+12\:$
$4^7\cdot3^5$
$18\:+\:8\:+2$
$3x^4+9x^3+9x^2+9x+6$
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