// Keep moving right, but adjust up and down as you go.

while(true) {
    var enemy = hero.findNearestEnemy();
    var xPos = hero.pos.x + 5;
    var yPos = 17;
    if(enemy) {
        // Adjust y up or down to get away from yaks.
        if(enemy.pos.y > hero.pos.y) {
            // If the Yak is above you, subtract 3 from yPos.
            yPos -= 3;
        }

else if (enemy.pos.y < hero.pos.y) {
            // If the Yak is below you, add 3 to yPos.
           yPos += 3;
        }
    }
    hero.moveXY(xPos, yPos);
}

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