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if(  3-2 == abs( 3+2 - 2*$var )  ) {
    # q-:
}

if(  not $var**3 - 12*$var**2 + 41*$var - 42  ) {
    # $var is 2, 3, or 7
}

if(  3 == ( $var | 1 )  ) {