What will be displayed after the following code executes?

$mystr=$ 'yes'

yourstr $=\text{'}no\text{'}$

$mystr+=$ yourstr

print $(mystr)$

yes $+no$ yes $+no$

yes $+no**2$

yes $+$ no yes $+$ no

yes $+$ no $*2$

yesno

yesnono