diff --git a/pdf/Algorithmic_complexity.pdf b/pdf/Algorithmic_complexity.pdf
index d6fe1cb..687e16a 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 b5a5714..3119b85 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 f8d387e..6a9185a 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 365e6a8..614c1de 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 d3066ec..01f2a96 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 55d90eb..ef12d15 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 639c01c..4a1d3dc 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 ad6e281..fdde79f 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 a850181..7f482b5 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 cf7f1df..f9b00df 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 c59695d..13c3cff 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 7986155..cf4825f 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 53760d8..2c17595 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 f28acaf..9bc5853 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 7087c41..2f18205 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 4a5c94a..1974e25 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 7ebce5a..c2200f3 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 5a2c69b..e24a25f 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 6636714..8ea34af 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 8cb81e1..d49126c 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 42e5a17..08f286d 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 78162f7..9e3f7c1 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 ab9458d..f29c3a9 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 4484813..ca4fb3a 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 34cbaa2..d7721e6 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 b8e5e63..ac1a640 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 08320e1..520fc07 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 0defbc8..5d40997 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 a6bcdeb..7e5fe0f 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 6609b46..c457f23 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 943e608..a5e349e 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 9e7d103..e5f3667 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 78d51d1..01923c4 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 3afeb79..467bf11 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 f23d2cf..b4c85cd 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 e7cb4bf..3bbd42a 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 7e74796..068f1e2 100644
Binary files a/pdf/Recursion.pdf and b/pdf/Recursion.pdf differ
diff --git a/pdf/Reiteration.pdf b/pdf/Reiteration.pdf
index 1e2cd4a..b635bf8 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 17c4c07..1bd5f5e 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 1951e99..2b317cb 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 1f8a07f..a9bb5e9 100644
Binary files a/pdf/Soundness.pdf and b/pdf/Soundness.pdf differ
diff --git a/pdf/Stacks.pdf b/pdf/Stacks.pdf
index be8c02f..bb12359 100644
Binary files a/pdf/Stacks.pdf and b/pdf/Stacks.pdf differ
diff --git a/pdf/Syllogism.pdf b/pdf/Syllogism.pdf
index d35beeb..df9c12d 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 a7e34ea..b9fd43d 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 789295a..783a3f0 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 c273069..dc272cb 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 0a12fba..32a3e58 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 2e408c2..c8f2320 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 87c2a64..499bdb0 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 c61b73e..4ff6a65 100644
Binary files a/pdf/Why_computers_use_binary.pdf and b/pdf/Why_computers_use_binary.pdf differ