diff --git a/pdf/Algorithmic_complexity.pdf b/pdf/Algorithmic_complexity.pdf
index aa378ae..389e7a7 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 12f9b59..05c4221 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 b7e3962..9ab986c 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 a383368..721a3ca 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 c13d429..04e3f43 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 32fb6a2..b58238e 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 cad7ab5..386847a 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 e617197..4a54947 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 667d329..7a789a9 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 ef2f67a..0088469 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 9773190..edac8dd 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 4eb3c55..fe8b1f1 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 e91cb9e..ab82730 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 b241114..0f74aa1 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 1ea0a49..06b5ca5 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 c165a72..bcff93e 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 f071916..3f78141 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 d900ac5..1bd0dd8 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 eb7fd50..1e1b1b8 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 0740dfb..eb98b37 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 a5c0302..d65bc23 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 c1b401c..e274a9c 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 a0dbe51..3f23153 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 6fc361e..c9917e6 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 cf8a65c..286c0fc 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 ce1c56e..41dfa28 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 1023df8..2d20496 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 9a03051..29d170f 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 e26c175..32d0488 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 7f3117a..38f1371 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 917a72e..6eb84fd 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 88ace31..e310c15 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 19aebd1..6f0a77d 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 fe97e48..515eb07 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 2fdcf7a..e6418af 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 7674b54..6368061 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 d3c7acb..d367ba3 100644
Binary files a/pdf/Recursion.pdf and b/pdf/Recursion.pdf differ
diff --git a/pdf/Reiteration.pdf b/pdf/Reiteration.pdf
index f526e35..85d4bdf 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 a356d7d..31e507a 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 2cff7fb..62ad33d 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 11b8819..716b4a6 100644
Binary files a/pdf/Soundness.pdf and b/pdf/Soundness.pdf differ
diff --git a/pdf/Stacks.pdf b/pdf/Stacks.pdf
index f425729..f22096b 100644
Binary files a/pdf/Stacks.pdf and b/pdf/Stacks.pdf differ
diff --git a/pdf/Syllogism.pdf b/pdf/Syllogism.pdf
index a3164d5..78923fd 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 3fb5b8b..8890bbc 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 74dc83c..edc2bcc 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 9311576..c7739b6 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 5c2dca8..22bdcda 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 ca37a5b..5c9a014 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 8c4a11a..600f505 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 6b5647e..57af844 100644
Binary files a/pdf/Why_computers_use_binary.pdf and b/pdf/Why_computers_use_binary.pdf differ