TYJWUORCOTAXF3OPVYJL3SCH3QYXZW5FLHKI3XSI4IVBV5XPEHAAC
2P35LNRY3ZWGLARBNWLQEW2QPS3CTK4Z677ZZYFX4GLVNLUONYBAC
J5UVLXOK6EDIL5I7VKWH4V2QDS4DPD7FHRK6XBWSXFRQS4JKXFZQC
unless defined $referer && $referer eq $base;
unless defined $referer && substr($referer, 0, length $base) eq $base;