diff --git a/pdf/Algorithmic_complexity.pdf b/pdf/Algorithmic_complexity.pdf
index 49610cf..06141b5 100644
Binary files a/pdf/Algorithmic_complexity.pdf and b/pdf/Algorithmic_complexity.pdf differ
diff --git a/pdf/Arrays.pdf b/pdf/Arrays.pdf
index 70f4cfa..caec5fe 100644
Binary files a/pdf/Arrays.pdf and b/pdf/Arrays.pdf differ
diff --git a/pdf/Assembly_programs.pdf b/pdf/Assembly_programs.pdf
index 66de7cb..8a94a4a 100644
Binary files a/pdf/Assembly_programs.pdf and b/pdf/Assembly_programs.pdf differ
diff --git a/pdf/Atomic_and_molecular_sentences.pdf b/pdf/Atomic_and_molecular_sentences.pdf
index 5a80481..1e7ac0e 100644
Binary files a/pdf/Atomic_and_molecular_sentences.pdf and b/pdf/Atomic_and_molecular_sentences.pdf differ
diff --git a/pdf/Axioms_of_set_theory.pdf b/pdf/Axioms_of_set_theory.pdf
index 94c5bcd..fe9718b 100644
Binary files a/pdf/Axioms_of_set_theory.pdf and b/pdf/Axioms_of_set_theory.pdf differ
diff --git a/pdf/Basic_database_concepts.pdf b/pdf/Basic_database_concepts.pdf
index fdf7101..5027036 100644
Binary files a/pdf/Basic_database_concepts.pdf and b/pdf/Basic_database_concepts.pdf differ
diff --git a/pdf/Basic_properties_of_sets.pdf b/pdf/Basic_properties_of_sets.pdf
index 7b9ddfd..6152daf 100644
Binary files a/pdf/Basic_properties_of_sets.pdf and b/pdf/Basic_properties_of_sets.pdf differ
diff --git a/pdf/Biconditional_Elimination.pdf b/pdf/Biconditional_Elimination.pdf
index 8f79d59..b9328cd 100644
Binary files a/pdf/Biconditional_Elimination.pdf and b/pdf/Biconditional_Elimination.pdf differ
diff --git a/pdf/Biconditional_Introduction.pdf b/pdf/Biconditional_Introduction.pdf
index 67e8358..7202ee1 100644
Binary files a/pdf/Biconditional_Introduction.pdf and b/pdf/Biconditional_Introduction.pdf differ
diff --git a/pdf/Binary_arithmetic.pdf b/pdf/Binary_arithmetic.pdf
index e8e877d..0823662 100644
Binary files a/pdf/Binary_arithmetic.pdf and b/pdf/Binary_arithmetic.pdf differ
diff --git a/pdf/Binary_arithmetic_with_circuits.pdf b/pdf/Binary_arithmetic_with_circuits.pdf
index 2348b4d..67ef424 100644
Binary files a/pdf/Binary_arithmetic_with_circuits.pdf and b/pdf/Binary_arithmetic_with_circuits.pdf differ
diff --git a/pdf/Bits,_bytes,_nibbles.pdf b/pdf/Bits,_bytes,_nibbles.pdf
index dc57a77..edf8434 100644
Binary files a/pdf/Bits,_bytes,_nibbles.pdf and b/pdf/Bits,_bytes,_nibbles.pdf differ
diff --git a/pdf/Compile_from_source.pdf b/pdf/Compile_from_source.pdf
index d2cd4bc..dc9243b 100644
Binary files a/pdf/Compile_from_source.pdf and b/pdf/Compile_from_source.pdf differ
diff --git a/pdf/Conditional_Elimination.pdf b/pdf/Conditional_Elimination.pdf
index 1201e6b..163444d 100644
Binary files a/pdf/Conditional_Elimination.pdf and b/pdf/Conditional_Elimination.pdf differ
diff --git a/pdf/Conditional_Introduction.pdf b/pdf/Conditional_Introduction.pdf
index 146ee43..5a3cdc8 100644
Binary files a/pdf/Conditional_Introduction.pdf and b/pdf/Conditional_Introduction.pdf differ
diff --git a/pdf/Conjunction_Elimination.pdf b/pdf/Conjunction_Elimination.pdf
index 1c8b01b..a478f96 100644
Binary files a/pdf/Conjunction_Elimination.pdf and b/pdf/Conjunction_Elimination.pdf differ
diff --git a/pdf/Conjunction_Introduction.pdf b/pdf/Conjunction_Introduction.pdf
index ee9f883..00710c4 100644
Binary files a/pdf/Conjunction_Introduction.pdf and b/pdf/Conjunction_Introduction.pdf differ
diff --git a/pdf/Defining_a_computer.pdf b/pdf/Defining_a_computer.pdf
index 3a460fb..df74554 100644
Binary files a/pdf/Defining_a_computer.pdf and b/pdf/Defining_a_computer.pdf differ
diff --git a/pdf/Design_features_of_language.pdf b/pdf/Design_features_of_language.pdf
index d2cbf7f..cd8ef41 100644
Binary files a/pdf/Design_features_of_language.pdf and b/pdf/Design_features_of_language.pdf differ
diff --git a/pdf/Disjunction_Elimination.pdf b/pdf/Disjunction_Elimination.pdf
index 37cd7bc..2c6a54a 100644
Binary files a/pdf/Disjunction_Elimination.pdf and b/pdf/Disjunction_Elimination.pdf differ
diff --git a/pdf/Disjunction_Introduction.pdf b/pdf/Disjunction_Introduction.pdf
index 9d8701d..72cc13f 100644
Binary files a/pdf/Disjunction_Introduction.pdf and b/pdf/Disjunction_Introduction.pdf differ
diff --git a/pdf/HTTP_request_types.pdf b/pdf/HTTP_request_types.pdf
index 5b9edb3..8ae3aac 100644
Binary files a/pdf/HTTP_request_types.pdf and b/pdf/HTTP_request_types.pdf differ
diff --git a/pdf/Indeterminacy.pdf b/pdf/Indeterminacy.pdf
index d4bc80b..60efee2 100644
Binary files a/pdf/Indeterminacy.pdf and b/pdf/Indeterminacy.pdf differ
diff --git a/pdf/Law_of_the_Excluded_Middle.pdf b/pdf/Law_of_the_Excluded_Middle.pdf
index e18a128..7ff95e8 100644
Binary files a/pdf/Law_of_the_Excluded_Middle.pdf and b/pdf/Law_of_the_Excluded_Middle.pdf differ
diff --git a/pdf/Logic_circuits.pdf b/pdf/Logic_circuits.pdf
index 285665e..fbb5c27 100644
Binary files a/pdf/Logic_circuits.pdf and b/pdf/Logic_circuits.pdf differ
diff --git a/pdf/Logic_gates.pdf b/pdf/Logic_gates.pdf
index a3040d6..af4d079 100644
Binary files a/pdf/Logic_gates.pdf and b/pdf/Logic_gates.pdf differ
diff --git a/pdf/Logical_possibility_and_necessity.pdf b/pdf/Logical_possibility_and_necessity.pdf
index b182446..f87f781 100644
Binary files a/pdf/Logical_possibility_and_necessity.pdf and b/pdf/Logical_possibility_and_necessity.pdf differ
diff --git a/pdf/Lovelace_quote.pdf b/pdf/Lovelace_quote.pdf
index 4b78499..48f25e3 100644
Binary files a/pdf/Lovelace_quote.pdf and b/pdf/Lovelace_quote.pdf differ
diff --git a/pdf/Morphology.pdf b/pdf/Morphology.pdf
index ff62699..0f7f92c 100644
Binary files a/pdf/Morphology.pdf and b/pdf/Morphology.pdf differ
diff --git a/pdf/Negation_Elimination.pdf b/pdf/Negation_Elimination.pdf
index 04cf42a..c9cfd1e 100644
Binary files a/pdf/Negation_Elimination.pdf and b/pdf/Negation_Elimination.pdf differ
diff --git a/pdf/Negation_Introduction.pdf b/pdf/Negation_Introduction.pdf
index d64b5ff..d16a769 100644
Binary files a/pdf/Negation_Introduction.pdf and b/pdf/Negation_Introduction.pdf differ
diff --git a/pdf/Object_language_and_meta-language.pdf b/pdf/Object_language_and_meta-language.pdf
index 0a3f183..7b75d84 100644
Binary files a/pdf/Object_language_and_meta-language.pdf and b/pdf/Object_language_and_meta-language.pdf differ
diff --git a/pdf/Package_management_in_Arch.pdf b/pdf/Package_management_in_Arch.pdf
index 60a1362..c82f509 100644
Binary files a/pdf/Package_management_in_Arch.pdf and b/pdf/Package_management_in_Arch.pdf differ
diff --git a/pdf/Primary_key.pdf b/pdf/Primary_key.pdf
index 24c83ba..419cd69 100644
Binary files a/pdf/Primary_key.pdf and b/pdf/Primary_key.pdf differ
diff --git a/pdf/Queue.pdf b/pdf/Queue.pdf
index a1c6f0f..b72f752 100644
Binary files a/pdf/Queue.pdf and b/pdf/Queue.pdf differ
diff --git a/pdf/RESTful_APIs.pdf b/pdf/RESTful_APIs.pdf
index 9565735..70e3901 100644
Binary files a/pdf/RESTful_APIs.pdf and b/pdf/RESTful_APIs.pdf differ
diff --git a/pdf/Recursion.pdf b/pdf/Recursion.pdf
index 98efd95..a8fead8 100644
Binary files a/pdf/Recursion.pdf and b/pdf/Recursion.pdf differ
diff --git a/pdf/Reiteration.pdf b/pdf/Reiteration.pdf
index f3f746d..df7080f 100644
Binary files a/pdf/Reiteration.pdf and b/pdf/Reiteration.pdf differ
diff --git a/pdf/SQL_syntax.pdf b/pdf/SQL_syntax.pdf
index 07e5011..a398b1a 100644
Binary files a/pdf/SQL_syntax.pdf and b/pdf/SQL_syntax.pdf differ
diff --git a/pdf/Semantic_versioning.pdf b/pdf/Semantic_versioning.pdf
index 5f7474c..3aa07a4 100644
Binary files a/pdf/Semantic_versioning.pdf and b/pdf/Semantic_versioning.pdf differ
diff --git a/pdf/Soundness.pdf b/pdf/Soundness.pdf
index 84ae176..cd6b65e 100644
Binary files a/pdf/Soundness.pdf and b/pdf/Soundness.pdf differ
diff --git a/pdf/Stacks.pdf b/pdf/Stacks.pdf
index 403add8..ebb55e9 100644
Binary files a/pdf/Stacks.pdf and b/pdf/Stacks.pdf differ
diff --git a/pdf/Syllogism.pdf b/pdf/Syllogism.pdf
index 94f4506..be83b5f 100644
Binary files a/pdf/Syllogism.pdf and b/pdf/Syllogism.pdf differ
diff --git a/pdf/The_Pragmatic_Programmer_1999.pdf b/pdf/The_Pragmatic_Programmer_1999.pdf
index 51d5a7e..1975267 100644
Binary files a/pdf/The_Pragmatic_Programmer_1999.pdf and b/pdf/The_Pragmatic_Programmer_1999.pdf differ
diff --git a/pdf/The_binary_number_system.pdf b/pdf/The_binary_number_system.pdf
index ebce9a5..9a6f99d 100644
Binary files a/pdf/The_binary_number_system.pdf and b/pdf/The_binary_number_system.pdf differ
diff --git a/pdf/Theorems_and_empty_sets.pdf b/pdf/Theorems_and_empty_sets.pdf
index e1b484d..c3cd335 100644
Binary files a/pdf/Theorems_and_empty_sets.pdf and b/pdf/Theorems_and_empty_sets.pdf differ
diff --git a/pdf/Turing_machines.pdf b/pdf/Turing_machines.pdf
index 19189e1..e5a8206 100644
Binary files a/pdf/Turing_machines.pdf and b/pdf/Turing_machines.pdf differ
diff --git a/pdf/User_management.pdf b/pdf/User_management.pdf
index b35d61c..fc9d7c3 100644
Binary files a/pdf/User_management.pdf and b/pdf/User_management.pdf differ
diff --git a/pdf/Von_Neumann_architecture.pdf b/pdf/Von_Neumann_architecture.pdf
index 38fe790..3c41ab4 100644
Binary files a/pdf/Von_Neumann_architecture.pdf and b/pdf/Von_Neumann_architecture.pdf differ
diff --git a/pdf/Why_computers_use_binary.pdf b/pdf/Why_computers_use_binary.pdf
index bb54b85..d48cc3f 100644
Binary files a/pdf/Why_computers_use_binary.pdf and b/pdf/Why_computers_use_binary.pdf differ