$B80$r5U$5$KF~$l$k>{(B (1) Hard to enter lock

$B80$r5U$5$KF~$l$k>{!J#1!?#5!K(B

049

049

$B80$N:,K\$rDL$9(B

$B

	$B$R$H$DLa$k(B
	$B@>B $B$KLa$k(B

NISHIMURA, Kazuo (nishimura@komazawa-u.ac.jp)