https://github.com/google/guava/guava: Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. 
final class com.google.common.base.PairwiseEquivalence<T> extends com.google.common.base.Equivalence<java.lang.Iterable<T>> implements java.io.Serializable
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.google.common.base.PairwiseEquivalence
  super_class: com.google.common.base.Equivalence
{
  final com.google.common.base.Equivalence<? super T> elementEquivalence;
    descriptor: Lcom/google/common/base/Equivalence;
    flags: (0x0010) ACC_FINAL
    Signature: Lcom/google/common/base/Equivalence<-TT;>;

  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  void <init>(com.google.common.base.Equivalence<? super T>);
    descriptor: (Lcom/google/common/base/Equivalence;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.base.PairwiseEquivalence this
        start local 1 // com.google.common.base.Equivalence elementEquivalence
         0: .line 27
            aload 0 /* this */
            invokespecial com.google.common.base.Equivalence.<init>:()V
         1: .line 28
            aload 0 /* this */
            aload 1 /* elementEquivalence */
            invokestatic com.google.common.base.Preconditions.checkNotNull:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast com.google.common.base.Equivalence
            putfield com.google.common.base.PairwiseEquivalence.elementEquivalence:Lcom/google/common/base/Equivalence;
         2: .line 29
            return
        end local 1 // com.google.common.base.Equivalence elementEquivalence
        end local 0 // com.google.common.base.PairwiseEquivalence this
      LocalVariableTable:
        Start  End  Slot                Name  Signature
            0    3     0                this  Lcom/google/common/base/PairwiseEquivalence<TT;>;
            0    3     1  elementEquivalence  Lcom/google/common/base/Equivalence<-TT;>;
    Signature: (Lcom/google/common/base/Equivalence<-TT;>;)V
    MethodParameters:
                    Name  Flags
      elementEquivalence  

  protected boolean doEquivalent(java.lang.Iterable<T>, java.lang.Iterable<T>);
    descriptor: (Ljava/lang/Iterable;Ljava/lang/Iterable;)Z
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=5, args_size=3
        start local 0 // com.google.common.base.PairwiseEquivalence this
        start local 1 // java.lang.Iterable iterableA
        start local 2 // java.lang.Iterable iterableB
         0: .line 33
            aload 1 /* iterableA */
            invokeinterface java.lang.Iterable.iterator:()Ljava/util/Iterator;
            astore 3 /* iteratorA */
        start local 3 // java.util.Iterator iteratorA
         1: .line 34
            aload 2 /* iterableB */
            invokeinterface java.lang.Iterable.iterator:()Ljava/util/Iterator;
            astore 4 /* iteratorB */
        start local 4 // java.util.Iterator iteratorB
         2: .line 36
            goto 5
         3: .line 37
      StackMap locals: java.util.Iterator java.util.Iterator
      StackMap stack:
            aload 0 /* this */
            getfield com.google.common.base.PairwiseEquivalence.elementEquivalence:Lcom/google/common/base/Equivalence;
            aload 3 /* iteratorA */
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            aload 4 /* iteratorB */
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            invokevirtual com.google.common.base.Equivalence.equivalent:(Ljava/lang/Object;Ljava/lang/Object;)Z
            ifne 5
         4: .line 38
            iconst_0
            ireturn
         5: .line 36
      StackMap locals:
      StackMap stack:
            aload 3 /* iteratorA */
            invokeinterface java.util.Iterator.hasNext:()Z
            ifeq 6
            aload 4 /* iteratorB */
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 3
         6: .line 42
      StackMap locals:
      StackMap stack:
            aload 3 /* iteratorA */
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 7
            aload 4 /* iteratorB */
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 7
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         7: iconst_0
            ireturn
        end local 4 // java.util.Iterator iteratorB
        end local 3 // java.util.Iterator iteratorA
        end local 2 // java.lang.Iterable iterableB
        end local 1 // java.lang.Iterable iterableA
        end local 0 // com.google.common.base.PairwiseEquivalence this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    8     0       this  Lcom/google/common/base/PairwiseEquivalence<TT;>;
            0    8     1  iterableA  Ljava/lang/Iterable<TT;>;
            0    8     2  iterableB  Ljava/lang/Iterable<TT;>;
            1    8     3  iteratorA  Ljava/util/Iterator<TT;>;
            2    8     4  iteratorB  Ljava/util/Iterator<TT;>;
    Signature: (Ljava/lang/Iterable<TT;>;Ljava/lang/Iterable<TT;>;)Z
    MethodParameters:
           Name  Flags
      iterableA  
      iterableB  

  protected int doHash(java.lang.Iterable<T>);
    descriptor: (Ljava/lang/Iterable;)I
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=5, args_size=2
        start local 0 // com.google.common.base.PairwiseEquivalence this
        start local 1 // java.lang.Iterable iterable
         0: .line 47
            ldc 78721
            istore 2 /* hash */
        start local 2 // int hash
         1: .line 48
            aload 1 /* iterable */
            invokeinterface java.lang.Iterable.iterator:()Ljava/util/Iterator;
            astore 4
            goto 4
      StackMap locals: com.google.common.base.PairwiseEquivalence java.lang.Iterable int top java.util.Iterator
      StackMap stack:
         2: aload 4
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.lang.Object
            astore 3 /* element */
        start local 3 // java.lang.Object element
         3: .line 49
            iload 2 /* hash */
            sipush 24943
            imul
            aload 0 /* this */
            getfield com.google.common.base.PairwiseEquivalence.elementEquivalence:Lcom/google/common/base/Equivalence;
            aload 3 /* element */
            invokevirtual com.google.common.base.Equivalence.hash:(Ljava/lang/Object;)I
            iadd
            istore 2 /* hash */
        end local 3 // java.lang.Object element
         4: .line 48
      StackMap locals:
      StackMap stack:
            aload 4
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 2
         5: .line 51
            iload 2 /* hash */
            ireturn
        end local 2 // int hash
        end local 1 // java.lang.Iterable iterable
        end local 0 // com.google.common.base.PairwiseEquivalence this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    6     0      this  Lcom/google/common/base/PairwiseEquivalence<TT;>;
            0    6     1  iterable  Ljava/lang/Iterable<TT;>;
            1    6     2      hash  I
            3    4     3   element  TT;
    Signature: (Ljava/lang/Iterable<TT;>;)I
    MethodParameters:
          Name  Flags
      iterable  

  public boolean equals(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // com.google.common.base.PairwiseEquivalence this
        start local 1 // java.lang.Object object
         0: .line 56
            aload 1 /* object */
            instanceof com.google.common.base.PairwiseEquivalence
            ifeq 3
         1: .line 57
            aload 1 /* object */
            checkcast com.google.common.base.PairwiseEquivalence
            astore 2 /* that */
        start local 2 // com.google.common.base.PairwiseEquivalence that
         2: .line 58
            aload 0 /* this */
            getfield com.google.common.base.PairwiseEquivalence.elementEquivalence:Lcom/google/common/base/Equivalence;
            aload 2 /* that */
            getfield com.google.common.base.PairwiseEquivalence.elementEquivalence:Lcom/google/common/base/Equivalence;
            invokevirtual java.lang.Object.equals:(Ljava/lang/Object;)Z
            ireturn
        end local 2 // com.google.common.base.PairwiseEquivalence that
         3: .line 61
      StackMap locals:
      StackMap stack:
            iconst_0
            ireturn
        end local 1 // java.lang.Object object
        end local 0 // com.google.common.base.PairwiseEquivalence this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    4     0    this  Lcom/google/common/base/PairwiseEquivalence<TT;>;
            0    4     1  object  Ljava/lang/Object;
            2    3     2    that  Lcom/google/common/base/PairwiseEquivalence<*>;
    RuntimeVisibleTypeAnnotations: 
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
    MethodParameters:
        Name  Flags
      object  

  public int hashCode();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.google.common.base.PairwiseEquivalence this
         0: .line 66
            aload 0 /* this */
            getfield com.google.common.base.PairwiseEquivalence.elementEquivalence:Lcom/google/common/base/Equivalence;
            invokevirtual java.lang.Object.hashCode:()I
            ldc 1185147655
            ixor
            ireturn
        end local 0 // com.google.common.base.PairwiseEquivalence this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/base/PairwiseEquivalence<TT;>;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.google.common.base.PairwiseEquivalence this
         0: .line 71
            new java.lang.StringBuilder
            dup
            invokespecial java.lang.StringBuilder.<init>:()V
            aload 0 /* this */
            getfield com.google.common.base.PairwiseEquivalence.elementEquivalence:Lcom/google/common/base/Equivalence;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            ldc ".pairwise()"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 0 // com.google.common.base.PairwiseEquivalence this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/base/PairwiseEquivalence<TT;>;

  protected boolean doEquivalent(java.lang.Object, java.lang.Object);
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)Z
    flags: (0x1044) ACC_PROTECTED, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 1
            aload 0
            aload 1
            checkcast java.lang.Iterable
            aload 2
            checkcast java.lang.Iterable
            invokevirtual com.google.common.base.PairwiseEquivalence.doEquivalent:(Ljava/lang/Iterable;Ljava/lang/Iterable;)Z
            ireturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  protected int doHash(java.lang.Object);
    descriptor: (Ljava/lang/Object;)I
    flags: (0x1044) ACC_PROTECTED, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast java.lang.Iterable
            invokevirtual com.google.common.base.PairwiseEquivalence.doHash:(Ljava/lang/Iterable;)I
            ireturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <T:Ljava/lang/Object;>Lcom/google/common/base/Equivalence<Ljava/lang/Iterable<TT;>;>;Ljava/io/Serializable;
SourceFile: "PairwiseEquivalence.java"
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtCompatible(serializable = true)