explain a number of KERNAL coincidental similarities.

strings/00DD29

@@ -0,0 +1,6 @@
+Do something with $DD00 and compare it with some value.
+
+$DD00 is one of the CIA ports, so checking the value of inputs
+on this port is something rather expected and common.
+Also, this sequence doesn't even contain a whole instruction.
+Not copyrightable.

strings/00DD60

@@ -0,0 +1,5 @@
+Do something with $DD00 and return from sub-routine.
+
+Only one whole instruction.  Also $DD00 is a CIA IO port, and
+so it gets used quite a lot, so is no surprise to see it appearing.
+Not copyrightable.

strings/00DD60AD00DD

@@ -0,0 +1,7 @@
+do something with $DD00, then RTS, then read $DD00
+
+Again, $DD00 is a CIA IO register, and so there are a number 
+of routines that are required that simply check or modify the
+contents of this register in order to implement the IEC serial
+protocol.  Thus it is totally unsurprising to find routines that
+start by reading $DD00 and then processing it in some way.

strings/021860

@@ -0,0 +1,6 @@
+Instruction fragment + CLC + RTS
+
+C flag is used to indicate success/failure of many KERNAL routines.
+Thus finding CLC before an RTS is not at all surprising, and the
+obvious way to indicate success in a routine.
+Not copyrightable.

strings/60AD00DD

@@ -0,0 +1,7 @@
+Return from subroutine, then read $DD00 , and do something with it.
+
+Again, $DD00 is a CIA IO register, and so there are a number 
+of routines that are required that simply check or modify the
+contents of this register in order to implement the IEC serial
+protocol.  Thus it is totally unsurprising to find routines that
+start by reading $DD00 and then processing it in some way.

strings/60AD00DD29

@@ -0,0 +1,7 @@
+Return from subroutine, then read $DD00 , and do something with it.
+
+Again, $DD00 is a CIA IO register, and so there are a number 
+of routines that are required that simply check or modify the
+contents of this register in order to implement the IEC serial
+protocol.  Thus it is totally unsurprising to find routines that
+start by reading $DD00 and then processing it in some way.

strings/D2FFC8

@@ -0,0 +1,5 @@
+Part of JSR $FFD2 / INX
+
+Essentially part of a loop to print some characters.
+No creativity. Only a single whole instruction.
+Not copyrightable.

strings/DD60AD00DD

@@ -0,0 +1,7 @@
+do something with $DD00, then RTS, then read $DD00
+
+Again, $DD00 is a CIA IO register, and so there are a number 
+of routines that are required that simply check or modify the
+contents of this register in order to implement the IEC serial
+protocol.  Thus it is totally unsurprising to find routines that
+start by reading $DD00 and then processing it in some way.

strings/DD60AD00DD09

@@ -0,0 +1,7 @@
+do something with $DD00, then RTS, then read $DD00
+
+Again, $DD00 is a CIA IO register, and so there are a number 
+of routines that are required that simply check or modify the
+contents of this register in order to implement the IEC serial
+protocol.  Thus it is totally unsurprising to find routines that
+start by reading $DD00 and then processing it in some way.