diff --git a/pdf/Algorithmic_complexity.pdf b/pdf/Algorithmic_complexity.pdf
index c01e3e7..fe41088 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 c99eabd..7ba9def 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 a8d69be..de59613 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 1a110c9..0b1712a 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 9420f31..c84cafb 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 88676ae..fc2072c 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 9452f0c..0dd4f88 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 0e0d3f6..4b9ca8d 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 1f12f74..f802344 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 28d82f1..bec561e 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 872cab7..05e02e0 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 5d42584..4cb213e 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 bc911e0..aed2011 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 c8a527e..f6bb7fa 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 42828d2..eb3fd06 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 29bd28d..19bc00f 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 95a274d..3e59e70 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 8572cfe..e20a0e2 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 2716b34..432dd79 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 f767ba8..da74f1a 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 d475a5a..4814391 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 8d59c78..7d0ffc1 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 76080c7..7dc32e3 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 a3f9e1c..b4da259 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 3665456..d07a15e 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 923e0b0..b0e2737 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 dfea7ac..7f7939f 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 725af0b..db18d35 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 a8d5499..ab45da9 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 9d39e47..0d110d9 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 f9907f9..5a186cd 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 01385dd..b7bba2f 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 d26423e..b2cb02e 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 1c01f02..9fd724b 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 0878254..76ffce1 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 667ffe9..6583d43 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 919cb97..469104f 100644
Binary files a/pdf/Recursion.pdf and b/pdf/Recursion.pdf differ
diff --git a/pdf/Reiteration.pdf b/pdf/Reiteration.pdf
index cf32e1a..83296f8 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 420a5ae..199d110 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 beb43ed..9fc1cbf 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 f101567..295f3ee 100644
Binary files a/pdf/Soundness.pdf and b/pdf/Soundness.pdf differ
diff --git a/pdf/Stacks.pdf b/pdf/Stacks.pdf
index 78adbe5..df54ef3 100644
Binary files a/pdf/Stacks.pdf and b/pdf/Stacks.pdf differ
diff --git a/pdf/Syllogism.pdf b/pdf/Syllogism.pdf
index 5bac76e..638b82d 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 09a9df1..033bc2a 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 c1d1558..a8a009a 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 21732ee..95a08af 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 e799bb4..80b0567 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 9d6c3c0..f1ee9b7 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 a4024c4..9da3235 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 4ed2549..7ef3005 100644
Binary files a/pdf/Why_computers_use_binary.pdf and b/pdf/Why_computers_use_binary.pdf differ