The following code writes the value of 0 to 255 to the PWMpin, but skips the values in the range of 41 to 119.
for (x = 0; x <= 255; x ++) {
  if (x > 40 && x < 120) {  // create jump in values
    continue;
  }
  analogWrite(PWMpin, x);
  delay(50);
}
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