diff --git a/ch13_security.adoc b/ch13_security.adoc
index a16b797c..4d01ba9a 100644
--- a/ch13_security.adoc
+++ b/ch13_security.adoc
@@ -30,7 +30,6 @@ is based on independent verification, the network can be open
 and no encryption is required for Bitcoin traffic (although encryption
 can still be useful).
 
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 On a traditional payment network, such as a credit card system, the
 payment is open-ended because it contains the user's private identifier
 (the credit card number). After the initial charge, anyone with access
@@ -80,7 +79,6 @@ removes control from users and centralizes control over keys in a single
 system. Many such systems have been hacked, with disastrous consequences
 for their customers.
 
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 Unless you are prepared to invest heavily in operational security,
 multiple layers of access control, and audits (as the traditional banks
 do), you should think very carefully before taking funds outside of
@@ -184,7 +182,6 @@ an escalation in both hacking techniques and security solutions. In
 simple terms, hackers now have a very juicy target and users have a
 clear incentive to defend themselves.
 
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 Over the past three years, as a direct result of Bitcoin adoption, we
 have seen tremendous innovation in the realm of information security in
 the form of hardware encryption, key storage and hardware signing devices,
@@ -283,7 +280,6 @@ funds if the user is not available to unlock them. In most cases, in
 fact, the families of Bitcoin users might be completely unaware of the
 existence of the bitcoin funds.
 
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 If you have a lot of bitcoins, you should consider sharing access details
 with a trusted relative or lawyer. A more complex survivability scheme
 can be set up with multisignature access and estate planning through a