$score=90;
if($score<=55){
echo 'grade 0';}
else if($score<=5){
echo'grade 0.5';}
else if($score<=55){
echo'grade 1';}
else if($score<=60){
echo'grade 1.5';}
else if($score<=65){
echo'grade 2';}
else if($score<=70){
echo'grade 2.5';}
else if($score<=75){
echo'grade 3';}
else if($score<=85){
echo'grade 3.5';}
else
{
echo 'grade4';
}
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