A student well versed in even one technique will naturally see corresponding points in other techniques. A upper level punch, a lower punch, a front punch and a reverse punch are all essentially the same. Looking over thirty-odd kata, he should be able to see that they are essentially variations on just a handful.
Gichin FunakoshiWhen there are no avenues of escape or one is caught even before any attempt to escape can be made, then for the first time the use of self-defense techniques should be considered. Even at times like these, do not show any intention of attacking, but first let the attacker become careless. At that time attack him concentrating one's whole strength in one blow to a vital point and in the moment of surprise, escape and seek shelter and help.
Gichin Funakoshi