my %hash = (1,'a',2,'b',3,'c');

foreach keys(%hash) {
print
}

##</code><code>##

my %hash = (1,'a',2,'b',3,'c');

foreach (keys(%hash)) {
print
}

##</code><code>##

($_='kkvvttuubbooppuuiiffssqqffssmmiibbddllffss')
 =~y~b-v~a-z~s;                             print